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Guess who's performing at MTV's premiere party for The Hills later this month? Mariah Carey! And in true Mariah fashion, Mimi's making the whole Hills world revolve around her. Exhibit A: she's bringing California to New York! "The party will be held in NYC instead of LA, because Mariah is being a huge diva," an insider tells Perez Hilton. "She is scheduled to perform at the party, and she refuses to fly out to LA. SO, instead MTV is having to fly out EVERYONE from LA to NYC." (An MTV source denies it, saying that the premiere was always supposed to be in NY.) Still, we're kinda hoping a Lauren Conrad/Mariah catfight goes down. Meow!

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