MILAN – Sex and celebrity are the name of the game in Milan. No wonder everyone’s favorite pop tart, Britney Spears, hopped on a plane and hightailed it into town. While here, she stayed at fellow-blonde-bombshell Donatella Versace’s palazzo in Lake Como, then made her way to the Versace show Tuesday night decked out in a glittering Versace dress covered with rainbow swirls. Sandwiched between a pair of ferocious looking security guards, the diva was led to her front-row seat, then ooed and ahhed her way through Donatella’s sex-capade romp. For more on Milan’s sultry scene, see pages 6 to 10.