December 06, 2007 05:55 PM

Video courtesy Warner Bros.
Keira Knightley admits she can’t keep her clothes on.

Last year she went nude for Vanity Fair‘s Hollywood Issue. Now the 22-year-old is topless on the cover of Interview and posing for a new Chanel ad with only a strategically placed hat. What gives?

“I don’t know. People ask [me to pose naked] and I just say yes,” the Atonement star told Ellen DeGeneres on Thursday s show. “I find it vaguely liberating.”

“I hope I don’t become a nudist,” added the Oscar-nominated actress. “I am on my way.”

When DeGeneres noted, “I don’t know why you put on clothes to come to the show,” Knightley gamely offered, “Should I take them off now?”

“No, no,” the talks show host responded quickly. “We’re on daytime.”

The London-based actress also addressed persistent (and, she says, untrue) rumors that she has an eating disorder. “I haven’t [got one],” she insisted. “Which I’ve said a lot.” Knightly insists her famously thin physique is the result of good genes and a healthy diet.

“I don’t eat junk,” she told DeGeneres. “I cook. I go to farmers markets in London and cook really good sort of organic foods.”

Knightley – famous for her period roles in Pirates of the Caribbean and Pride & Prejudice – also said she doesn’t go to the gym. Still, she added, “The corsets are a workout. Heavy dresses and all that.”

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