Rooney Mara: 'Bitter Pill' Set Musician?

Rooney Mara rocks out on the set of her new film, The Bitter Pill, on Wednesday (May 9) in Queens, New York.

After shooting, the 27-year-old actress carried a guitar on her back while exiting her trailer.

PHOTOS: Check out the latest pics of Rooney Mara

Rooney has been keeping busy in the Big Apple working on her new flick these past few weeks with co-stars Jude Law and Channing Tatum.

On Monday, Rooney attended the 2012 Met Ball and showed off a lot of leg in a beautiful Givenchy one-shoulder black gown.