Justin Bieber and Mariah Carey Get Festive For The Rockefeller Center Tree Lighting

Justin Bieber and Mariah Carey taping their Rockafeller Center tree-lighting performances.Photo: NBC/Getty

If the holidays had a celebrity spokesperson, it would be Mariah Carey. The woman LOVES. CHRISTMAS. Like, we kind of think she has a secret wing of her house that's actually the North Pole, and she just hid it from us in that incredible episode of MTV Cribs where she keeps changing her outfit. Or maybe she has a magical Christmas wardrobe, Narnia-style, that transports you to Santa's workshop. Mariah can do anything. You know what, Mariah Carey is Santa Clause. How can we be so sure? Well forget for a second that "All I Want For Christmas Is You" is the single greatest Christmas song of all time. Forget that. Also forget how much Mariah likes to say "