This oughtta put some glitter back on her cleavage: When the American Music Awards nominations were announced yesterday, comeback belter Mariah Carey received four. (Diva translation: Yippee! That's more than anyone else!) Trailing the presumably by-now-emancipated Mimi with three nominations apiece are 50 Cent, Green Day and Kelly Clarkson. Narrowly beating out Cedric the Dog Walker for the host job, Cedric the Entertainer will dole out the trophies during ABC's live telecast on Nov. 22.