Actress Keira Knightley enjoys stripping off for photo shoots so much, she fears she'll become a nudist. The Pride And Prejudice star posed nude with Scarlett Johansson for the cover of Vanity Fair last year (Feb06) and can currently be seen baring nearly all in an advertising campaign for Chanel perfume. But the 22-year-old is worried her exhibitionist ways will cause her to ditch clothes entirely in the future. Knightley says, "I don't know why it happened this way. People ask me to pose naked and I just say yes. I find it vaguely liberating. "I hope I don't become a nudist, but I'm definitely on my way."