Kate Winslet is shocked Hugh Hefner wants her to bare all for Playboy  because she doesn’t think she’s sexy enough to grace the cover of the magazine.Winslet regularly strips for her movies, including scenes in her lastest, The Reader. Men’s mag mogul Hefner wants to feature Winslet in Playboy, telling reporters: "There’s no question we would be interested in Kate. It’s a competitive market, more than it used to be, so she would be a most welcome addition in our pages."However she has laughed off Hefner’s suggestion, insisting she won’t be gracing the magazine’s cover. Her spokesperson says "This is not a proposal that would interest her."And when a source told Winslet of Hefner’s offer, she replied: "I have no idea what you’re talking about. I don’t believe that for one second!"