'Pitch Perfect' Star Ester Dean Reveals What It Was Like on Set: "These Girls Are Very Dirty!"

It sounds kind of like it was one big co-ed slumber party on the Baton Rouge, La, set of Pitch Perfect, which we got to visit way back in November.

We caught up with Ester Dean, who plays Cynthia Rose, and who also happens to be a very successful songwriter! Bet you didn't know Ester has written for stars such as Rihanna ("Rude Boy" and "Where Have You Been"), Katy Perry ("Firework") and Kelly Clarkson ("Mr. Know It All").

Pitch Perfect is Ester's big acting debut. In the clip above, she shares her favorite song to perform in the film (hint: Rebel Wilson), what her character and castmates were like and gives us a little snippet of her singing "S&M" a capella!

Ester is currently signed to Interscope Records and is managed by Jay-Z's Roc Nation. Be on the lookout for her debut EP, which she is working on right now!

What was your favorite a capella song from Pitch Perfect?