After some careful, careful vetting by lawyers, HarperCollins has released Confessions of a Video Vixen, a steamy tell-all — and "cautionary tale," adds the publisher — by music-video dancer Karrine Steffans. The hardcover vividly details the booty-shaker's acquaintances with/evaluations of such "biggies" as Vin Diesel (whom she says has "an enviable eight-pack" — and more), Fred Durst and Sean Combs. This all sounds so juicy, I almost hate to ask: Who is Karrine Steffans?