Bradley Cooper and his American Sniper costar Sienna Miller posed together on the red carpet at the movie’s premiere in New York City Monday evening.

Bradley Cooper, Sienna Miller At ‘American Sniper’ Premiere

Cooper and Miller were both impressively styled at the premiere of Clint Eastwood’s American Sniper at the Frederick P. Rose Hall at Lincoln Center. Miller turned heads in an ivory Balenciaga dress with sheer sleeves, a crisscross satin bodice and diamond appliques. The British actress wore Harry Winston earrings and a necklace to complete the glamorous look. At her side, Cooper looked dapper in a suit by Tom Ford.

In American Sniper, Cooper plays the late U.S. Navy Seal Chris Kyle, who is thought to be one of the most lethal snipers in American history. Eastwood’s film shows the soldier, who died tragically in a shooting range incident, grappling with balancing his military duties with being a good father and husband to his wife Taya, played by Miller in the film.

“Personally, to set a goal and actually achieve it, which I had a lot of fear that I wasn’t gonna be able to do,” Cooper told The Hollywood Reporter about playing Kyle. “The honor of being able to walk — pretend to walk — in this man’s shoes; to have the trust of his family, having his father look me in the eyes and trust me to do this; being able to walk the path with Clint Eastwood, who is one of the reasons why I wanted to become an actor and get involved with film; getting to make a great friend with Sienna Miller — all of those things.”

American Sniper, adapted from Kyle’s autobiography, also stars Luke Grimes, Jake McDorman and Brian Hallisay.

American Sniper hits theaters Christmas Day, Dec. 25.