Sienna Miller looked effortlessly stylish as she attended the Carolina Herrera X Frame party in New York City on Thursday.

The actress, 42, was joined by her boyfriend Oli Green, 27, for the celebration which was held at Chez Margaux.

She wore a casual ochre denim co-ordinate consisting of an oversized jacket and a matching pair of wide leg jeans.

Sienna teamed her outfit with a plain T-shirt, a pair of Calvin Klein boxers and a grey Prada handbag.

Oli opted for a similar look as he paired a suede jacket with black jeans and a white T-shirt.

The actress and actor welcomed their first child together earlier this year after they started dating in 2022.

Sienna Miller looked effortlessly stylish as she attended the Carolina Herrera X Frame party in New York City on Thursday

The actress, 42, was joined by her boyfriend Oli Green, 27, for the celebration which was held at Chez Margaux

The actress gave birth to her daughter Marlowe, now 12, with her ex Tom Sturridge in July 2012.

And after welcoming her second child to the world earlier this year with Oli, at the age of 42, Sienna told Stellar Magazine that she could not recommend late motherhood more highly.

The American Sniper star welcomed their daughter, whose name she has not revealed, in January.

‘My own experience of motherhood 12 years later is completely different’ the British star told the publication.

‘I’m a very different person. People often have lots to say about having babies in your 40s as women, but I can’t advocate for it more. I feel very lucky.’

Last month, Jude Law revealed he’s ‘moved on’ from the time in his life when he was engaged to Sienna, as he posed for a suave new shoot with VARIETY.

The actor, 51, told the publication ‘that time in his life is now over,’ after his relationship was the centre of huge public attention.

She wore a casual ochre denim co-ordinate consisting of an oversized jacket and a matching pair of wide leg jeans (pictured with Erik Torstensson)