Sienna Miller Gushes About Working with Bradley Cooper on 'American Sniper'

Sienna Miller arrives at LAX Airport to catch a flight out of town on Saturday (November 22) in Los Angeles.

The 32-year-old American Sniper actress screened the film in Los Angeles the day before.

Sienna recently gushed about working with Bradley Cooper on the film and how he never broke character on set.

“He’s a phenomenal actor,” Sienna told the Boston Globe. “He never broke character, so I really got to know Chris Kyle before Bradley Cooper.”

American Sniper, which hits theaters on January 16, is about a Navy S.E.A.L. (Cooper) who recounts his military career, which includes more than 150 confirmed kills.

FYI: Sienna is wearing an Isabel Marant burgundy leather top and Siwy Denim jeans at the screening.

10+ pictures inside of Sienna Miller catching a flight…