She has been taking the West End stage by storm in Cat On A Hot Tin Roof.
And Sienna Miller was the leading lady once again when she hosted Saturday Night Fever with The OUTNET at The Electric Cinema, in London on Sunday.
Away from the stage, the 35-year-old New Yorker showcased her slim physique in the slinky patterned jumpsuit at the special screening.
Leading lady: Sienna Miller showcased her slender physique in a slinky jumpsuit when she hosted Saturday Night Fever with The OUTNET at The Electric Cinema, in London on Sunday
Sienna also teased a glimpse of her ample cleavage in the plunging neckline of the garment, drawing further attention to her chest with the decorative buttons.
Proving accessories make an outfit, the style maven walked with poise in sky-scraper platform sandals complete with straps in the same pattern as her jumpsuit.
Going for a different look, the fashion designer wore her golden locks in a single plait only letting a few wisps of her tresses fall out to frame her face.
She’s got style: Sienna also teased a glimpse of her ample cleavage in the plunging neckline of the garment, drawing further attention to her chest with the decorative buttons
How to accessorise: The style maven walked with poise in sky-scraper platform sandals complete with straps in the same pattern as her jumpsuit
The star added an edgy feel to her evening ensemble, toting a glass mirrored style handbag. She styled drop earrings and a simple necklace for a hint of sparkle.
American beauty Sienna was joined by the great and the good of the showbiz world including the likes of Julien Macdonald.
The special screening of Saturday Night Fever celebrated 15 years of GRAND CLASSICS.
She had the time of her life as she took a night off her theatre duties to host the show.
Great fun: She had the time of her life as she took a night off her theatre duties to host the show
Different look: Sienna had tied her hair up at the start of the night in a loosely tousled plait but by the end of the night she let her golden locks down
Good company: Sienna was joined by the great and the good of the showbiz world at the special screening including the likes of Kim Hersov who donned frayed jeans for the night
Sienna is currently starring in Tennessee Williams’ play Cat On The Tin Roof, alongside Skins actor Jack O’Connell.
She has received rave reviews for her performance as Maggie in the drama, which runs until October 7.
The Benedict Andrews’ directed play centres around the sexual tension between her character and her alcoholic husband Brick, who some believe is in denial about his homosexuality.
Racy lady! Lady Victoria Hervey oozed sex appeal in a raunchy top with a nude body emblazoned across it, teamed with a sexy scarlet blazer and fishnet tights
Team work! Lady Victoria rubbed shoulders with dazzling Jelena Fahey at the event
Vision in black: Julien Macdonald made a striking appearance head-to-toe in black for the occasion
Let the bubbly flow: Brenda Meaney and Colm Meaney enjoyed catching up over a glass of red
Cosy: Sienna Miller threw her arm around Linda Fulford, who donned a sparkly jacket, and wrapped her arm around her Katrina Pavlos
Sienna sparked false engagement rumours earlier this month after accidentally leaving a a piece of costume jewellery on while leaving the theatre.
The sizeable ring set tongues wagging about potential wedding bells for her and her director boyfriend, Bennett Miller, 50, who she met on the set of the 2014 film Foxcatcher.
However, a source close to Sienna later dismissed the claims as a ‘silly mistake’ and said there was no engagement.
Sienna shares daughter Marlowe, five with her former fiancé Tom Sturridge, whom she dated from 2011 to 2015.
Kooky: Valeria Napoleone opted for an uncharacteristic attire made up of a rugby shirt and wellies while Meredith Ostrom went hell for leather in skintight PVC trousers
Squad goals: Adi Cook, Jo Miller and Kelly Hoppen (L-R) enjoyed catching up behind the scenes at the special screening
Buzzing: Sheherazade Goldsmith, Katrina Pavlos and Laura Bailey were in high spirits as they enjoyed mixing at the event