Pick up any fashion magazine nowadays and you are bound to wonder: Is this a sports star or a showbiz celebrity?The line between sports and entertainment is becoming increasingly blurred. Eight-medal winner Michael Phelps is reportedly having a go at Hollywood while in Chinaformer Olympic champion gymnast Liu Xuanwas thrust into the limelight when she retired in 2001. But now after several years in showbiz Liu is making a comeback.