Matthew Fox (41): The "Party of Five" cutie is all grown up. Now he's the default leader of the survivors of the plane crash on "Lost," tortured by the past and some crazy-ass tattoos. But Fox's sex appeal is the glue that holds the show together, with love triangles and rectangles enough to keep fans intrigued for several more seasons. Makes you want to get "Lost," doesn't he? (Fernando Leon/Retna Ltd.)