05/14/2014 09:19 am ET Updated Dec 06, 2017

Sienna Miller Is Unrecognizable With Red Hair On 'American Sniper' Set

David M. Benett via Getty Images

Sienna Miller looked unrecognizable as she graced the Los Angeles set of Clint Eastwood's new flick, "American Sniper," on Tuesday, May 13.

Just like her co-star Bradley Cooper, who gained 40 pounds to play Navy SEAL Chris Kyle in the film (which is based on a true story), Miller changed her appearance drastically for her role as Kyle's wife Taya Renae Kyle. The 32-year-old actress debuted her new fiery red hair, which is a sudden change from her typically blond locks.

Miller reportedly beat out actresses Jaimie Alexander and Kate Mara for the coveted redheaded role.

sienna miller

sienna miller