Wow, Mariah Carey had her hands full on Tuesday. The diva's other sworn enemy, Madonna, celebrated her 47th birthday by falling off a horse in a riding accident at her country home outside London. The Material Girl, who suffered three cracked ribs, a broken collarbone and a broken hand, was taken by her husband, Guy Ritchie, to an undisclosed hospital where she was treated and released. Although Madge's recovery is expected to take up to eight weeks, her reps claim it will not affect the November launch of her new album, Confessions on a Dancefloor. Still, Mariah can claim a partial victory here.