Sienna Miller turns heads in a dramatic feathered mini-dress as she joins co-star Dominic West at War premiere in New York

And Sienna Miller made sure to dress to impress as she turned heads in a dramatic feathered mini-dress at HBO's War premiere in New York on Tuesday night. 

The actress, 44, wowed in the designer Erdem piece which featured a black satin bodice and huge white feathers for the skirt. 

Beaming in snaps the star completed her look with black heels and wore her blonde locks in a loose up do. 

She was joined on the carpet by her co-star Dominic West who looked rather dapper in a navy blue suit. 

Sienna plays Carla Duval while Dominic, 56, takes on the character of her ex Morgan Henderson in the legal drama which follows two elite London law firms going head-to-head for victory. 

Sienna Miller turned heads in a dramatic feathered mini-dress at HBO's War premiere in New York on Tuesday night 

She was joined on the carpet by her co-star Dominic West who looked rather dapper in a navy blue suit

The premiere comes after Sienna recently revealed that she was pregnant while filming the entirety of the new divorce drama and was 35 weeks by the end of shooting.

The actress welcomed her third child in April, her second with her partner Oli Green, 29, and they got engaged two months later. They also welcomed a child in January 2024.

Sienna also shares a 14-year-old daughter, Marlowe, with actor Tom Sturridge, who she dated for four years until July 2015.

In a new interview, Sienna told how the shoot was tough due to her pregnancy and that it was long days of filming which saw her 'leaving and coming home in the dark'.

She starred alongside Phoebe Fox in War, who was also pregnant during shooting. Her pregnancy was written into the plot however.

Sienna joked to the The Observer: 'She got in first. We sat together scoffing Freddos in between shots.'

It comes after earlier this month Sienna said that she feels like a 'lactating heifer' and is struggling to dress her 'massive boobs' after being 'pregnant or breastfeeding for nearly four years'.

In a candid interview, the mother-of-three joked that she was so tired that she 'doesn't know who she is' any more as she juggles work and raising her brood.

She said: 'I have completely lost my fashion sense. I've been pregnant or breastfeeding for nearly four years, and I think something happens to the brain – or you're so f***ing tired – that you sacrifice your identity. 

'You're just 'mother'... and not in the Gen-Z way, as much as I would like to be.'

The actress, 44, wowed in the designer Erdem piece which featured a black satin bodice and huge white feathers for the skirt

Beaming in snaps the star completed her look with black heels and wore her blonde locks in a loose up do

She accessorised with a pair of elaborate silver earrings 

The cast posed for a snap together (pictured L-R, Pip Torrens, Sienna Miller, Akiya Henry, Nick Mohammed, Dominic, Shaheen Jafargholi, Nina Sosanya, Phoebe Fox  Archie Renaux)

Sienna plays Carla Duval while Dominic, 56, takes on the character of her ex Morgan Henderson in the legal drama which follows two elite London law firms going head-to-head 

The premiere comes after Sienna recently revealed that she was pregnant while filming the entirety of the new divorce drama and was 35 weeks by the end of shooting

The pair were seen stopping for interviews ahead of the premiere

'I'm just really questioning all this, because I'm just so underslept and I kind of don't know who I am. I also have massive boobs, which I don't know how to dress. Anyway, this is far too much information….' 

She also told Vogue that on the day of her interview with them she had been 'up breastfeeding since the crack of dawn', before adding: 'I just feel like a kind of lactating heifer.' 

Sienna also revealed that she often turns to model Alexa Chung – who is her ex Tom's partner – for fashion advice, including what to wear for the recent Oasis: Don't Look Back In Anger premiere.

In May, Sienna appeared on the Jimmy Fallon show in New York just three weeks after giving birth.

During her sit-down interview with the TV host she confessed that motherhood was exhausting at times.

Sienna said: '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.

'It's crazy to be talking words and wearing a dress. What has happened from pajama gate.'

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