'We did it everywhere!' Sienna Miller gets cosy with co-star Ben Affleck at Live By Night premiere... after crying with laughter during their NINE HOURS of steamy sex scenes

By Ciara Farmer For Mailonline

Published: 04:15 EST, 10 January 2017 | Updated: 12:21 EST, 10 January 2017

They star as lovers in upcoming gangster flick Live By Night. 

And Sienna Miller, who plays Irish minx Emma Gould, looked like a lovestruck admirer as she hit the red carpet with her co-star and director Ben Affleck at the Los Angeles premiere of the star-studded movie. 

The 35-year-old Brit looked phenomenal in a fashion-forward frilled gown with racy sheer panels, shortly after speaking to E! about their many sex scenes, which left her in fits of laughter.

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Nine hours of nooky: Sienna Miller, who plays Irish minx Emma Gould, looked like a lovestruck admirer as she hit the red carpet with her co-star and director Ben Affleck at the Los Angeles premiere of the star-studded movie

Sienna, who has long been famed for her impeccable dress sense, dazzled in her cornflower blue gown which boasted tiers of ruffles extending from her waist. 

The dress was adorned with intricate gold beading circling each ruffle while the top of the dress gave a glimpse of her taut abs through the sheer panelling. 

Ensuring she did not expose too much, the blonde beauty protected her modesty with the cape-like frill extending across her bust and shoulders. 

As the ever-reigning queen of boho, Sienna wore her tresses in loose waves falling from a centre parting while her make-up was dewy yet she added a dash of colour with her slick of red lipstick.

Come here you! The 35-year-old Brit looked phenomenal in a fashion-forward frilled gown with racy sheer panels as she hit the red carpet, shortly after speaking to E! about their many sex scenes, which left her in fits of laughter

Try the tiered look like Sienna in her Gucci dress

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Stepping out to the Los Angeles premiere of her new film, Live By Night, Sienna Miller upheld her reputation as a style icon in a statement gown by Gucci.

Featuring sheer cornflower blue material embellished with intricate gold beading, a dramatic tiered skirt and a cape design top, this frock is not one for faint-hearted fashionistas.

It's a statement, eye-catching dress and Sienna pulled it off with total aplomb. It's from the Gucci spring/summer '17 collection, where there were plenty more gowns with an eccentric spin to be found.

It's the tiered skirt that really gives this dress its unique edge so if you're feeling inspired, make sure you check out our edit of similar styles from the high-street below. Our picks from ASOS, Traffic People and Maya are perfect for giving a nod to Sienna's Gucci look.

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Closer than ever: Ben meanwhile showed off his movie star good looks in a dashing blue suit paired with a funky polka dot tie, while also rocking a smattering of designer facial hair

Smiling away: The happy pair looked joyous to be launching the movie 

Up close: Sienna admitted their whopping nine hours of sex scenes tickled her

The object of his desire: The handsome star plays Joe Coughlin in the movie, the son of a Boston policeman, who falls in love with Sienna's character, Emma, who is the mistress of the Robert Glenister's character, Albert White , who is the boss of an Irish gang of Boston

Ben meanwhile showed off his movie star good looks in a dashing blue suit paired with a funky polka dot tie, while also rocking a smattering of designer facial hair. 

The handsome star plays Joe Coughlin in the movie, the son of a Boston policeman, who falls in love with Sienna's character, Emma, the mistress of the Robert Glenister's character, Albert White, who is the boss of an Irish gang of Boston. 

No action-packed movie would be complete without a romantic story laden with sex scenes - and Sienna admitted the duo were forced into a bevy of romantic scenes - some of which left her in unprofessional fits of laughter. 

Bidding hello! Sienna waves at the crowd to flash a hint of her sheer panel 

Sizzling: Sienna, who has long-been famed for her impeccable dress sense, dazzled in her cornflower blue gown which boasted tiers of ruffles extending from her waist

Brother and sister? She said: ' Ben and I are like brother and sister, thank God, so there was no awkwardness. There was just a lot of stupid giggling. He's very professional—I am not, but he is'

She said: 'Ben and I are like brother and sister, thank God, so there was no awkwardness. There was just a lot of stupid giggling. He's very professional—I am not, but he is. 

'In that environment, it was a cool scene. There was a montage in the script saying we did it everywhere: in the car, in the bar...I was like: "That's an entire day of just love scenes! OK. How do we do this?" 

'Obviously, by the time nine hours of it has gone past, I was shaking with tears running down my face. I mean, I can't tell you—but you have to laugh. Ben is just professional. It is what it is.'

All the stars: The movie boasts a star-studded cast 

Her pals: Sienna posed with her co-stars Elle Fanning and Zoe Saldana

Beaming beauty: Sienna certainly wowed the red carpet 

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