Keira Knightley ("Pride & Prejudice," "Atonement") says appearing nude in films is "very simple" for her.

"It was very simple. It was a sex scene and I never like them when they've got bras on," she said, referring a love scene in her latest film "The Edge of Love."

At the press conference to promote "Edge," she said, "I always bare my breasts. It's not like it's only in this film!"

The "Pirates of the Caribbean" actress also had a nude scene in last year's "Atonement."

As far as her singing goes, the actress is much shier. Of her singing scenes, she said, ""I thought I was going to die. My knees actually started buckling."

"In the first couple of takes I sounded like a pubescent boy."

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