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Sienna Miller Talks Bradley Cooper's Unrecognizable Appearance in 'American Sniper'

Sienna Miller shows off her vintage style while attending the opening night of Inside Rolls-Royce at the Saatchi Gallery on Thursday (November 13) in London, England.

The 32-year-old actress recently gushed about her co-star Bradley Cooper in their upcoming film American Sniper.

PHOTOS: Check out the latest pics of Sienna Miller

“His performance is completely compelling. He’s just unrecognizable,” Sienna shared to Entertainment Weekly. “He was training four to six hours a day. He put on 40 pounds of muscle. He looked and sounded like a different person. I’m pretty sure he didn’t break character for the entire thing. He dived into this completely head-first. It was an amazing thing to be around.”

FYI: Sienna is wearing a Reformation jumpsuit.

15+ pictures inside of Sienna Miller at Inside Rolls-RoyceMore Here! »

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Sienna Miller Steps Out for International Medical Corps Dinner

Sienna Miller is pretty in plum as she arrives at the International Medical Corps’ Annual Awards Dinner Ceremony at the Beverly Wilshire Four Seasons Hotel on Thursday (October 23) in Beverly Hills, Calif.

The 32-year-old actress was joined at the event by Teri Hatcher and Sanaa Lathan.

Sienna‘s next role is in the upcoming American Sniper, also starring Bradley Cooper, which follows a Navy S.E.A.L. who recounts his military career, which includes more than 150 confirmed kills.

10+ pictures inside of Teri Hatcher, Sienna Miller, and more at the ceremony… More Here! »

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Steve Carell's Co-Stars Avoided Him on the Set of 'Foxcatcher'

Sienna Miller looks gorgeous in a silver floor length gown at the gala premiere for her film Foxcatcher during the 2014 BFI London Film Festival held at Odeon Leicester Square on Thursday (October 16) in London, England.

The 32-year-old actress was joined on the red carpet by co-stars Steve Carell and Vanessa Redgrave, as well as director Bennett Miller. Earlier in the day, Steve and Bennett appeared at a photo call for the movie.

“The prosthetics influenced my performance more than I anticipated. Once all that make-up went on, people reacted and responded to me differently,” Steve told the Irish Examiner about his role in the movie. “I think just his demeanor was very off-putting to many people. People naturally wanted to be separate from me. I was off-putting [to them]. So organically I stayed in character because I didn’t really have any choice – no-one wanted to talk to me.”

Steve plays the role of John du Pont, the sponsor of Olympic wrestler Mark Schultz in the true life story.

15+ pictures inside of Sienna Miller and her cast at the premiere… More Here! »

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Sienna Miller Flashes Her Toned Midriff at 'Foxcatcher' Premiere

Sienna Miller shows off her toned tummy while attending the premiere of her latest film Foxcatcher during the 2014 New York Film Festival held at Alice Tully Hall on Friday (October 10) in New York City.

The 32-year-old actress was seen posing on the red carpet with her partner Tom Sturridge.

PHOTOS: Check out the latest pics of Sienna Miller

Sienna‘s co-stars Mark Ruffalo and Vanessa Redgrave were also spotted at the premiere for the film, which hits theaters on Friday, November 14!

10+ pictures inside of Sienna Miller and Tom Sturridge at the Foxcatcher premiere… More Here! »

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Sienna Miller Supports Partner Tom Sturridge at 'Effie Gray' World Premiere

Sienna Miller holds hands with her partner Tom Sturridge at the World Premiere of his film Effie Gray held at The Curzon Mayfair on Sunday evening (October 5) in London, England.

The 32-year-old actress and 28-year-old actor hit the red carpet to tons of fans wanting pictures and autographs!

Earlier that day, Sienna and Tom hit up the Chelsea vs. Arsenal soccer game in London – Chelsea won the match 2-0.

Effie Gray will hit theaters in the UK this coming week on October 10, with an expected US premiere date sometime this year.

FYI: Sienna is wearing a Roksanda dress.
More Here! »

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Bradley Cooper & Suki Waterhouse Meet Up With Sienna Miller & Tom Sturridge For Dinner!

Bradley Cooper and his girlfriend Suki Waterhouse hold hands after enjoying a romantic dinner at J Sheekey Restaurant on Tuesday (September 16) in London, England.

The 39-year-old actor and the 22-year-old English supermodel were joined by his Adam Jones co-star Sienna Miller, who brought her beau Tom Sturridge.

PHOTOS: Check out the latest pics of Bradley Cooper

Earlier in the night, Bradley was spotted spending time with his friend Anna Wintour, who is currently in town for London Fashion Week.

20+ pictures inside of Bradley Cooper and Suki Waterhouse grabbing dinner with Sienna Miller and Tom SturridgeMore Here! »

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Sienna Miller Channels 1970s Style in London!

Sienna Miller rocks a retro look while picking up a toy for her daughter Marlowe at Toys’R'Us on Thursday (August 21) in London, England.

Last week, the 32-year-old actress donned a leather jacket while filming scenes with co-star Daniel Bruhl for their upcoming movie Adam Jones.

PHOTOS: Check out the latest pics of Sienna Miller

It was recently announced that Sienna‘s partner Tom Sturridge has been cast as Henry IV in a BBC TV adaptation of the Shakespeare play Henry IV. We can’t wait to see him in the role! More Here! »

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