Kourtney Kardashian stepped out in style as she attended firstborn son Mason Disick’s 13th birthday party in West Hollywood on Saturday night.
The bombshell mother-of-three, 43, was reunited with ex-boyfriend Scott Disick, 39, with whom she shares Mason as well as Penelope, ten, and Reign, eight.
They were all together for the happy occasion and the POOSH founder’s sisters Kim and Khloe Kardashian, Kendall and Kylie Jenner, and mom Kris Jenner were also present.
![The bombshell mother-of-three, 43, was reunited with ex-boyfriend Scott Disick, 39, with whom she shares their 13-year-old as well as Penelope, ten, and Reign, eight](https://i.dailymail.co.uk/1s/2022/12/18/08/65697669-11550859-The_bombshell_mother_of_three_43_was_reunited_with_ex_boyfriend_-a-197_1671350780589.jpg)
Party time: Kourtney Kardashian stepped out in style as she attended firstborn son Mason Disick’s 13th birthday party in West Hollywood on Saturday night. The bombshell mother-of-three, 43, was reunited with ex-boyfriend Scott Disick, 39, with whom she shares their 13-year-old as well as Penelope, ten, and Reign, eight
![Smoldering: Kourtney, who tied the knot with husband Travis Barker earlier this year, was typically sexy in an all black ensemble that flashed her flat tummy](https://i.dailymail.co.uk/1s/2022/12/18/08/65697325-11550859-Hot_mama_Kourtney_Kardashian_stepped_out_in_style_as_she_attende-a-194_1671350780459.jpg)
Smoldering: Kourtney, who tied the knot with husband Travis Barker earlier this year, was typically sexy in an all black ensemble that flashed her flat tummy
Kourtney, who tied the knot with husband Travis Barker earlier this year, was typically sexy in an all black ensemble that flashed her flat tummy.
The former E! personality bared her cleavage in a plunging blouse with a crisscross wrap design with draping fabric.
It had a cutout at her midriff and extensively long sleeves that fell beyond her dainty black-manicured hands.
Mrs. Barker teamed it with bell-bottom trousers and a heart-shaped handbag with a thin, short strap.
![She arrived with her and Scott's daughter Penelope by her side](https://i.dailymail.co.uk/1s/2022/12/18/08/65697317-11550859-Smoldering_Kourtney_who_tied_the_knot_with_husband_Travis_Barker-a-193_1671350780457.jpg)
She arrived with her and Scott’s daughter Penelope by her side
![Looking great: The former E! personality bared her cleavage in a plunging blouse with a crisscross wrap design with draping fabric](https://i.dailymail.co.uk/1s/2022/12/18/08/65697319-11550859-Style_savvy_The_former_E_personality_bared_her_cleavage_in_a_plu-a-195_1671350780493.jpg)
Looking great: The former E! personality bared her cleavage in a plunging blouse with a crisscross wrap design with draping fabric
Her blunt bob was styled in a center part and ironed bone straight as it grazed her collarbone.
Scott wore black as well, as did most of the family members, showing up in a quilted jacket with an attached hood and silver hardware.
He wore loose-fitting pants and rounded out the look with combat boots as he escorted Reign to the dinner.
The real estate mogul’s dark hair was slicked back and his full beard was neatly trimmed for the special occasion.
Mason took a casual approach as he arrived in a black sweatshirt, baggy light wash jeans, and cream-hued Jordan sneakers.
![Laidback: Mason took a casual approach as he arrived in a black sweatshirt, baggy light wash jeans, and cream-hued Jordan sneakers](https://i.dailymail.co.uk/1s/2022/12/18/08/65697801-11550859-Laidback_Mason_took_a_casual_approach_as_he_arrived_in_a_black_s-a-196_1671350780497.jpg)
Laidback: Mason took a casual approach as he arrived in a black sweatshirt, baggy light wash jeans, and cream-hued Jordan sneakers
![Dad duty: Scott wore black as well, as did most of the family members, showing up in a quilted jacket with an attached hood and silver hardware](https://i.dailymail.co.uk/1s/2022/12/18/08/65697947-11550859-Dad_duty_Scott_wore_black_as_well_as_did_most_of_the_family_memb-a-199_1671350780636.jpg)
Dad duty: Scott wore black as well, as did most of the family members, showing up in a quilted jacket with an attached hood and silver hardware
![Outfit details: He wore loose-fitting pants and rounded out the look with combat boots as he escorted Reign to the dinner at Catch Steak](https://i.dailymail.co.uk/1s/2022/12/18/08/65697667-11550859-Outfit_details_He_wore_loose_fitting_pants_and_rounded_out_the_l-a-198_1671350780632.jpg)
![Micro fashion: Reign looked adorable in a red and black jersey and black joggers with a slight sheen](https://i.dailymail.co.uk/1s/2022/12/18/08/65697949-11550859-Micro_fashion_Reign_looked_adorable_in_a_red_and_black_jersey_an-a-200_1671350780638.jpg)
Outfit details: He wore loose-fitting pants and rounded out the look with combat boots as he escorted Reign to the dinner at Catch Steak
Reign looked adorable in a red and black jersey and black joggers with a slight sheen.
The little one’s pants had large cargo-style pockets that were outlined in white thread.
He looked adorably bright-eyed and excited as he held his father’s hand and walked in black and white checkered slip-on Vans sneakers.
His glossy light brown hair was chopped into a classic bowl cut that cropped right above his brown eyes.
Mason’s oldest aunt, Kim, brought the heat as she arrived in her go-to look since Miami’s Art Basel — high-waisted leather pants and a graphic tee.
![Scene stealer: Kim Kardashian stole the show as she arrived on Saturday night](https://i.dailymail.co.uk/1s/2022/12/18/09/65698833-11550859-Scene_stealer_Kim_Kardashian_stole_the_show_as_she_arrived_on_Sa-a-233_1671354828483.jpg)
Scene stealer: Kim Kardashian stole the show as she arrived on Saturday night
![Hell for leather: The SKKN founder, 42, flaunted her shrinking waistline in a pair of black leather high-waisted pants covered in sparkly black jewels](https://i.dailymail.co.uk/1s/2022/12/18/09/65698845-11550859-Hell_for_leather_The_SKKN_founder_42_flaunted_her_shrinking_wais-a-232_1671354828397.jpg)
![The sides of the legs and around the waist had the most crystal details](https://i.dailymail.co.uk/1s/2022/12/18/09/65698847-11550859-The_sides_of_the_legs_and_around_the_waist_had_the_most_crystal_-a-242_1671354829893.jpg)
Hell for leather: The SKKN founder, 42, flaunted her shrinking waistline in a pair of black leather high-waisted pants covered in sparkly black jewels
![Besties: Kim palled around with her 'momager' Kris Jenner, who looked chic in all-black](https://i.dailymail.co.uk/1s/2022/12/18/09/65698827-11550859-Besties_Kim_palled_around_with_her_momager_Kris_Jenner_who_looke-a-234_1671354828486.jpg)
Besties: Kim palled around with her ‘momager’ Kris Jenner, who looked chic in all-black
For Saturday evening’s ensemble the fashionista wore a vintage Up in Smoke Tour t-shirt that she rolled up to expose her toned stomach.
Her slightly flared trousers were decked out in a delicate beaded and lacy embellishment, which matched her teeny handbag.
She hit the pavement in pointy toe black heels that added height to her petite 5ft2in frame.
The former Mrs. West looked typically gorgeous with her lengthy honey blonde locks stretching down to her famous derriere.
![Tiny top: She styled the eye-catching trousers with an ultra cropped Up in Smoke Tour tee that stopped just below her bust](https://i.dailymail.co.uk/1s/2022/12/18/09/65698825-11550859-Tiny_top_She_styled_the_eye_catching_trousers_with_an_ultra_crop-a-236_1671354828513.jpg)
![Coordinating: Kim's pants came with a matching pint-sized purse that was not large enough to hold her cellphone](https://i.dailymail.co.uk/1s/2022/12/18/09/65698835-11550859-Coordinating_Kim_s_pants_came_with_a_matching_pint_sized_purse_t-a-235_1671354828487.jpg)
Tiny top: She styled the eye-catching trousers with an ultra cropped Up in Smoke Tour tee that stopped just below her bust
![Makeup maven: Kim showcased her beauty in a bronzy makeup look that complemented her honey-toned hair](https://i.dailymail.co.uk/1s/2022/12/18/09/65697855-11550859-Makeup_maven_Kim_showcased_her_beauty_in_a_bronzy_makeup_look_th-a-237_1671354828749.jpg)
Makeup maven: Kim showcased her beauty in a bronzy makeup look that complemented her honey-toned hair
![Joint exit: Kim left the gathering with mom Kris following closely behind](https://i.dailymail.co.uk/1s/2022/12/18/09/65697859-11550859-Joint_exit_Kim_left_the_gathering_with_mom_Kris_following_closel-a-243_1671354829990.jpg)
Joint exit: Kim left the gathering with mom Kris following closely behind
The highlighted tresses were softly textured in a loose wave pattern and arranged in a middle part.
She dropped in on Instagram earlier in the day to ask fans their opinion on her hairstyle as she posed the questions: ‘Thoughts on Honey? Should I dye my hair platinum again or go dark?
Days ago the beauty maven took to the app to give her nephew a birthday shout out as she declared, ‘You’re taller than me now!’
![Cutie pie: Penelope looked cute with her lustrous light brown locks blown straight and the front pieces tucked behind her ears](https://i.dailymail.co.uk/1s/2022/12/18/09/65697821-11550859-Cutie_pie_Penelope_looked_cute_with_her_lustrous_light_brown_loc-a-246_1671354830214.jpg)
Cutie pie: Penelope looked cute with her lustrous light brown locks blown straight and the front pieces tucked behind her ears
![Cat-like: Khloe sported a sleek black turtleneck and matching pantaleggings, which her trendsetting sister Kim helped make famous](https://i.dailymail.co.uk/1s/2022/12/18/09/65697323-11550859-Cat_like_Khloe_sported_a_sleek_black_turtleneck_and_matching_pan-a-238_1671354828831.jpg)
![Glam girl: The Good American founder added glamour to the getup as she sported a glossy black pair of sunglasses](https://i.dailymail.co.uk/1s/2022/12/18/09/65697311-11550859-Glam_girl_The_Good_American_founder_added_glamour_to_the_getup_a-a-245_1671354830178.jpg)
Cat-like: Khloe sported a sleek black turtleneck and matching pantaleggings, which her trendsetting sister Kim helped make famous. The Good American founder added glamour to the getup as she sported a glossy black pair of sunglasses
Penelope looked cute with her lustrous light brown locks blown straight and the front pieces tucked behind her ears.
In contrast to the majority of the family guests, the little girl sported a stark white ensemble consisting of an oversized t-shirt and pants.
She walked in accompanied by aunt Khloe, who showed off her phenomenal figure in a skintight look.
The mom-of-two sported a sleek black turtleneck and matching pantaleggings, which her trendsetting sister Kim helped make famous.
The Good American founder added glamour to the getup as she sported a glossy black pair of sunglasses.
![Blinged out: She accessorized further with a statement-making diamond encrusted chain with a cross pendant that rested on her chest](https://i.dailymail.co.uk/1s/2022/12/18/08/65697307-11550859-Blinged_out_She_accessorized_further_with_a_statement_making_dia-a-206_1671350780812.jpg)
Blinged out: She accessorized further with a statement-making diamond encrusted chain with a cross pendant that rested on her chest
![Well-put-together: Coordinating the showstopping outfit, she carried a tiny sparkling silver handbag that picked up on her jewelry](https://i.dailymail.co.uk/1s/2022/12/18/08/65697309-11550859-Well_put_together_Coordinating_the_showstopping_outfit_she_carri-a-207_1671350780842.jpg)
Well-put-together: Coordinating the showstopping outfit, she carried a tiny sparkling silver handbag that picked up on her jewelry
![Yum! Partygoers were treated to an ice cream truck set up outside the trendy eatery](https://i.dailymail.co.uk/1s/2022/12/18/08/65697321-11550859-Yum_Partygoers_were_treated_to_an_ice_cream_truck_set_up_outside-a-208_1671350780844.jpg)
Yum! Partygoers were treated to an ice cream truck set up outside the trendy eatery
She accessorized further with a statement-making diamond encrusted chain with a cross pendant that rested on her chest.
Coordinating the showstopping outfit, she carried a tiny sparkling silver handbag that picked up on her jewelry.
The Hulu personality’s warm-toned dirty blonde locks were parted down the middle and curled into sultry waves.
Kendall flaunted her impeccable fashion sense as she arrived in a silk black dress with a plunging neckline.
The runway regular demonstrated her stellar style in the number, which exposed her modest cleavage.
![Wow! Kendall flaunted her impeccable fashion sense as she arrived in a silk black dress with a plunging neckline](https://i.dailymail.co.uk/1s/2022/12/18/09/65697943-11550859-Wow_Kendall_flaunted_her_impeccable_fashion_sense_as_she_arrived-a-244_1671354830066.jpg)
![Details: The look boasted puffy short sleeves and a sheer, lacy bodice that flashed her clear complexion](https://i.dailymail.co.uk/1s/2022/12/18/09/65697823-11550859-Details_The_look_boasted_puffy_short_sleeves_and_a_sheer_lacy_bo-a-240_1671354829101.jpg)
Wow! Kendall flaunted her impeccable fashion sense as she arrived in a silk black dress with a plunging neckline
![Fashion prowess: The runway regular demonstrated her stellar style in the number, which exposed her modest cleavage](https://i.dailymail.co.uk/1s/2022/12/18/08/65697941-11550859-Fashion_prowess_The_runway_regular_demonstrated_her_stellar_styl-a-210_1671350780983.jpg)
Fashion prowess: The runway regular demonstrated her stellar style in the number, which exposed her modest cleavage
![A girl's best friend! The supermodel adorned her neck with a stunning diamond necklace and matching stud earrings](https://i.dailymail.co.uk/1s/2022/12/18/09/65697675-11550859-A_girl_s_best_friend_The_supermodel_adorned_her_neck_with_a_stun-a-249_1671354830346.jpg)
![The FWRD Creative Director's slim, trim, statuesque figure was on display in the slinky look, which nearly reached her ankles](https://i.dailymail.co.uk/1s/2022/12/18/09/65697685-11550859-The_FWRD_Creative_Director_s_slim_trim_statuesque_figure_was_on_-a-239_1671354829100.jpg)
A girl’s best friend! The supermodel adorned her neck with a stunning diamond necklace and matching stud earrings
![Footwear: The 818 Tequila founder slipped her feet into a pair of pointy-toe, slingback kitten heels](https://i.dailymail.co.uk/1s/2022/12/18/09/65697689-11550859-Footwear_The_818_Tequila_founder_slipped_her_feet_into_a_pair_of-a-247_1671354830232.jpg)
Footwear: The 818 Tequila founder slipped her feet into a pair of pointy-toe, slingback kitten heels
The look boasted puffy short sleeves and a sheer, lacy bodice that flashed her clear complexion.
The supermodel adorned her neck with a stunning diamond necklace and matching stud earrings.
The FWRD Creative Director’s slim, trim, statuesque figure was on display in the slinky look, which nearly reached her ankles.
Kendall, who recently ended a long-term relationship with NBA star Devin Booker, wore sheer black tights.
The 818 Tequila founder slipped her feet into a pair of pointy-toe, slingback kitten heels.
![Incredible: Kylie commanded attention in a body-hugging black PVC dress with a beige chiffon-like fabric interwoven via its asymmetric strap](https://i.dailymail.co.uk/1s/2022/12/18/09/65697403-11550859-Incredible_Kylie_commanded_attention_in_a_body_hugging_black_PVC-a-248_1671354830237.jpg)
![The material of the one-shoulder look overed one side of her chest as it teased her busty cleavage](https://i.dailymail.co.uk/1s/2022/12/18/09/65697399-11550859-The_material_of_the_one_shoulder_look_overed_one_side_of_her_che-a-255_1671354830694.jpg)
Incredible: Kylie commanded attention in a body-hugging black PVC dress with a beige chiffon-like fabric interwoven via its asymmetric strap
![Exit: After the event the billionaire beauty was seen getting into a luxury SUV to drive away](https://i.dailymail.co.uk/1s/2022/12/18/09/65697389-11550859-Exit_After_the_event_the_billionaire_beauty_was_seen_getting_int-a-241_1671354829459.jpg)
Exit: After the event the billionaire beauty was seen getting into a luxury SUV to drive away
![Topknot: Jenner wore her thick and lustrous dark locks in a trendy updo with an informal chignon](https://i.dailymail.co.uk/1s/2022/12/18/09/65697385-11550859-Topknot_Jenner_wore_her_thick_and_lustrous_dark_locks_in_a_trend-a-251_1671354830521.jpg)
Topknot: Jenner wore her thick and lustrous dark locks in a trendy updo with an informal chignon
Finally, she carried her belongings in a shiny black handbag, which she carried with clean, short manicured nails.
Kylie commanded attention in a body-hugging black PVC dress with a beige chiffon-like fabric interwoven via its asymmetric strap.
The material of the one-shoulder look covered one side of her chest as it teased her busty cleavage.
The long frock went past her knees and nicely coordinated with her matching black pointy-toe boots.
The mom-of-two, who shares her children with rapper Travis Scott, covered her eyes in rectangle-shaped shades.Incredible:
![Tight bond: The two gorgeous sisters stayed close as they arrived and exited with each other](https://i.dailymail.co.uk/1s/2022/12/18/08/65697387-11550859-Tight_bond_The_two_gorgeous_sisters_stayed_close_as_they_arrived-a-219_1671350781191.jpg)
Tight bond: The two gorgeous sisters stayed close as they arrived and exited with each other
![Taking it up a notch: Kendall reemerged from the family function in an equally eye-catching but slightly sexier look](https://i.dailymail.co.uk/1s/2022/12/18/09/65697397-11550859-Taking_it_up_a_notch_Kendall_reemerged_from_the_family_function_-a-250_1671354830519.jpg)
Taking it up a notch: Kendall reemerged from the family function in an equally eye-catching but slightly sexier look
![Mix and match: The star, whose family affectionately calls her Kenny, kept her accessories the same for the outfit change](https://i.dailymail.co.uk/1s/2022/12/18/09/65697395-11550859-Mix_and_match_The_star_whose_family_affectionately_calls_her_Ken-a-252_1671354830573.jpg)
Mix and match: The star, whose family affectionately calls her Kenny, kept her accessories the same for the outfit change
After the event the billionaire beauty was seen getting into a luxury SUV to drive away.
Kendall reemerged from the family function in an equally eye-catching but slightly sexier look.
The multihyphenate modeled a thigh-grazing metallic silver mini dress with the same tights and shoes from earlier.
She was prepared to continue her night out as she and Kylie headed to friend Zack Bia’s holiday party at Catch Steak.
The star, whose family affectionately calls her Kenny, kept her accessories the same for the outfit change.
![Sleek: Her long and dark hair was pulled back into a stylish and pristine ponytail arranged at the midpoint of her head](https://i.dailymail.co.uk/1s/2022/12/18/09/65697393-11550859-Sleek_Her_long_and_dark_hair_was_pulled_back_into_a_stylish_and_-a-253_1671354830574.jpg)
![Her tresses were slicked with a flattering center part, allowing her to show off her stunning visage as she took the locks off her face for the night](https://i.dailymail.co.uk/1s/2022/12/18/09/65697391-11550859-Her_tresses_were_slicked_with_a_flattering_center_part_allowing_-a-258_1671354830916.jpg)
Sleek: Her long and dark hair was pulled back into a stylish and pristine ponytail arranged at the midpoint of her head
![She can wear it all: Kendall showed her fashion range in the quick outfit change](https://i.dailymail.co.uk/1s/2022/12/18/09/65697401-11550859-She_can_wear_it_all_Kendall_showed_her_fashion_range_in_the_quic-a-254_1671354830685.jpg)
She can wear it all: Kendall showed her fashion range in the quick outfit change
Her long and dark hair was pulled back into a stylish and pristine ponytail arranged at the midpoint of her head.
It was slicked with a flattering center part, allowing her to show off her stunning visage as she took the locks off her face for the night.
Mom Kris looked pleased to be out with all of her kids in tow as she sported a classy black look.
The 67-year-old entertainment manager wore a chic blazer with flower-like accoutrements.
She added square-shaped two-toned black and silver earrings and wore a pair of black leather gloves.
![Happy! Mom Kris looked pleased to be out with all of her kids in tow as she sported a classy black look](https://i.dailymail.co.uk/1s/2022/12/18/09/65697315-11550859-Happy_Mom_Kris_looked_pleased_to_be_out_with_all_of_her_kids_in_-a-256_1671354830866.jpg)
Happy! Mom Kris looked pleased to be out with all of her kids in tow as she sported a classy black look
![Cheerful: Kris flashed a bright smile as she headed out from her grandson's celebration](https://i.dailymail.co.uk/1s/2022/12/18/09/65697857-11550859-Cheerful_Kris_flashed_a_bright_smile_as_she_headed_out_from_her_-a-257_1671354830867.jpg)
Cheerful: Kris flashed a bright smile as she headed out from her grandson’s celebration
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