Sienna Miller and partner Oli Green enjoy first outing as new parents just three weeks after welcoming their second child as they join Emily Blunt and husband John Krasinski at Jack Ryan: Ghost War premiere in NYC

New parents Sienna Miller and Oli Green joined fellow couple Emily Blunt and John Krasinski at Jack Ryan: Ghost War premiere in New York on Friday. 

The British actress, 44, and hunky model, 29, welcomed their second child just three weeks ago, they are already parents to a two-year-old daughter.  While Sienna is also mum to daughter Marlowe, 13, whom she shares with ex-fiancé Tom Sturridge. 

Taking to the red carpet Sienna, who plays Emma Marlow in the action movie, looked effortlessly stylish in a strapless oversized grey gown. 

She forwent a necklace, opting instead for statement earrings while Oli coordinated perfectly in a grey suit.

Meanwhile Emily, 43, was on hand to support husband John, 46, who leads the cast as Jack Ryan in the spin-off after playing the role for four seasons on TV.

The actress, who shares daughters Hazel, 14, and nine-year-old Violet with The Office star, caught the eye in an ostrich feathered mini dress.

Meanwhile John cut a more relaxed figure layering a green sports jacket over a white vest and black trousers. 

It comes after Sienna took to Instagram with candid footage of her breastfeeding her newborn baby backstage at The Tonight Show With Jimmy Fallon on Friday.

In the clip Sienna could be seen feeding the baby while she sat in the make-up chair before passing the little one to Oli who cooed over the newborn, whose gender or name the couple have not made public.

The new mum was later surprised with a Tonight Show baby grow, before she slipped into a figure-hugging yellow dress and headed onto the set.

Asked by the host which of her children are tougher to look after, she said: 'I would have said the teenage girl would be harder to juggle until the transatlantic flight I took yesterday with the toddler and the newborn. The toddler now wins hands down. It was an absolute disaster. There's no negotiating,'

She added: 'I got to the immigration line and just broke down.'

Sienna announced that she had welcomed her second child with Oli, telling E! News last week : 'It's happened. I have a tiny baby next door. It feels like stringing sentences together is a bit challenging...

'I'm on very little sleep but I'm madly in love with my baby.'

She is currently blazing the promo trail with her latest movie, Jack Ryan: Ghost War, and announced the sweet news to the publication in her promotional interview.  

Sienna announced her third pregnancy by revealing her blossoming bump at the star-studded  Fashion Awards in December. 

It was only right for the actress to make her revelation with a statement look on the blue carpet outside the Royal Albert Hall in London. 

And it is not the first time Sienna has used the red carpet at a fashion event to announce she is expecting. 

Back in September 2023, Sienna revealed she was pregnant with her second child at the star-studded Vogue World Show. 

The actress walked the red carpet at London's Theatre Royal Drury Lane in a Schiaparelli puffball skirt and a cropped shirt which showcased her baby bump.

Previously speaking about Oli, Sienna told Harper's Bazaar: 'I didn't expect to take it seriously and then quite quickly, I fell in love. 

'I wasn't like, "I'm gonna get a younger boyfriend." It was more, "F***! Why are you young? That's so annoying."  

'There is a difference in the way that generation of men respect women. It's specific to him, he is very wise and well-adjusted, but I do believe it's also that generation.

'They have grown up with a slightly more level playing field. I see it in his female friends as well as in the men.'