Sienna Miller American Sniper Cabaret
Credit: Courtesy

We're barely two months into 2015 and it's already safe to say that Sienna Miller is having an outstanding year. She not only stars in two Oscar-nominated films (American Sniper, Foxcatcher), but she's gearing up to sing and dance every night on Broadway in the revival of the beloved musical Cabaret. (She'll be replacing current star Emma Stone come Feb. 17.) The oh-so-busy Miller took some time out of her hectic schedule and stopped by The Late Show with David Letterman on Friday to chat about her work on the big screen, and her upcoming work on stage.

The actress—who looked lovely in a chic LWD—chatted with host David Letterman about the huge critical and box office success of American Sniper, and what it was like working with acclaimed director Clint Eastwood. "He's not intense, he's the most kind of laid-back, cool, [and] funny," she said of the director. Miller also shared an anecdote about how Eastwood would rub her pregnant belly on the set, and how she, Eastwood, and leading man Bradley Cooper were a tight-knit "little gang" on the set. Watch her full discussion of American Sniper—including working with the real-life woman she plays, the "stoic" Taya Kyle—here:

Though Miller and the American Sniper cast are still promoting their film until the Oscars on Feb. 22, the actress will soon be giving her time to the Great White Way. (Interestingly enough, Cooper is currently on Broadway as well, in The Elephant Man.) Miller will play the iconic Sally Bowles in the musical, and while she said she's still preparing and getting ready for her big debut, she feels like "she was born for a cabaret."

In fact, Miller was still so much in character, she forgot to take of Sally's green nail polish for her Late Show visit. Watch Miller's Cabaret chat—including her joke about taking on a musical ("I've never really sung and danced in front of anyone, unless I'm a few sheets to the wind")—below: