Sofia Richie, 19, in Mexico with boyfriend Scott Disick

They’ve enjoyed vacations to Miami, Puerto Vallarta and Italy since going public with their romance in September.

And on Friday, Scott Disick and Sofia Richie were spotted enjoying some sunshine in Los Cabos, Mexico.

The father of three, 34, and the 19-year-old daughter of Lionel Richie were seen relaxing on loungers together during their holiday.

Staying close: On Friday, Scott Disick and Sofia Richie were spotted enjoying some sunshine in Los Cabos, Mexico

Sofia flashed her flat stomach in a loose gray crop top with low-slung baggy patterned bottoms.

The teen added a gold necklace for a touch of sparkle to her otherwise low key ensemble.

She pulled her platinum blonde locks back into a low ponytail, opting for a deep side part.

Sofia appeared to peek over boyfriend Scott’s shoulder before sitting down on a lounger next to him.

The father of three, 34, and the 19-year-old daughter of Lionel Richie were seen relaxing on loungers together during their holiday

The father of three, 34, and the 19-year-old daughter of Lionel Richie were seen relaxing on loungers together during their holiday

How romantic: Sofia appeared to peek over boyfriend Scott's shoulder before sitting down on a lounger next to him

How romantic: Sofia appeared to peek over boyfriend Scott’s shoulder before sitting down on a lounger next to him

Scott donned his swimsuit trunks for his sun tanning session with his teen girlfriend.

Sofia and Scott, who has three children with ex partner Kourtney Kardashian, took a private plane to Los Cabos.

Sofia shared a snap of her large Hermes Birkin bag and Scott’s Louis Vuitton backpack to her Instagram story.

The doting dad posted a photo to Instagram showing off the plane.

Humble: Sofia shared a snap of her large Hermes Birkin bag and Scott's Louis Vuitton backpack to her Instagram story

Humble: Sofia shared a snap of her large Hermes Birkin bag and Scott’s Louis Vuitton backpack to her Instagram story

Family guy: The doting dad posted a photo to Instagram showing off the plane

Family guy: The doting dad posted a photo to Instagram showing off the plane

 Gentleman: He posted about heading out town on his Instagram story on Friday

 Gentleman: He posted about heading out town on his Instagram story on Friday

According to People, their relationship is ‘starting to fizzle.’

The magazine’s source added that ‘they’re starting to argue more’ and that it’s ‘bothering Sofia.’

People’s insider said that the teenager thought Scott ‘would be more serious about their relationship’ but she’s getting ‘more frustrated with him as time goes on.’

Adding: ‘Everything everyone has been telling her to look out for, she’s starting to see for herself.’ 

Sofia and Scott went public with their romance in late September, however they were linked as far back as May.

In September, they spent time together during a romantic trip to Miami.

Scott and the teen enjoyed a PDA filled trip to Puerto Vallarta, Mexico at the start of October.

Just weeks ago, Sofia and Scott jetted off to Milan and Venice, Italy for a brief holiday. 

Inseparable: Sofia and Scott went public with their romance in late September, however they were linked as far back as May; pictured heading to lunch in Beverly Hills on Tuesday

Inseparable: Sofia and Scott went public with their romance in late September, however they were linked as far back as May; pictured heading to lunch in Beverly Hills on Tuesday

Whirlwind: Just weeks ago, Sofia and Scott jetted off to Milan and Venice, Italy for a brief holiday; pictured in front of the Duomo di Milano

Whirlwind: Just weeks ago, Sofia and Scott jetted off to Milan and Venice, Italy for a brief holiday; pictured in front of the Duomo di Milano

Not shy: In September, they spent time together during a romantic trip to Miami

Not shy: In September, they spent time together during a romantic trip to Miami

Read more at DailyMail.co.uk