Sienna Miller may have just come off a starring role in Broadway’s Cabaret, but the 33-year-old traded the stage for the audience on Monday night in support of fiancé Tom Sturridge’s debut on the London stage in American Buffalo. Sienna was smiling ear to ear as she arrived at the Wyndham Theatre to cheer on the father of her two-year-old daughter, Marlowe.

CLICK ON PHOTOS FOR FULL GALLERYSienna Miller and Tom Sturridge at the American Buffalo after party

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Once again cementing her style icon status, Sienna chose a slouchy black top and matching trousers for the evening, which featured a colourful space-themed pattern. She teamed the laidback ensemble with a pair of chunky peep-toe heels.

The American Sniper actress finished off her outfit with a colourful small red leather cross-body bag and a pair of golden statement earrings. She wore her blonde cropped hair swept to the side and left slightly dishevelled, completing the look with a slick of dark red lipstick.

Sienna took a break from the spotlight after giving birth to her daughter back in 2012, but the actress has made a stylish comeback, turning heads in a series of fashion-forward ensembles.

Sienna enjoyed a night off from mommy duties

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After giving birth, the Alfie star told French newspaper Le Figaro that as a new mother, she didn’t have much time for fashion.

“I don’t know what the new fashion trends are!” she admitted. “With my daughter, Marlowe, I don’t have time to follow this anymore.

“I love fashion but I’m not obsessed by it. I love work, my style, but I don’t think only about that, even though some people want to believe the contrary. I don’t wake up in the morning, saying, ‘Hmm, what an icon I am!’

“My life is very different; I’ve got a baby who leaves me only two hours of peace each night.”