Demi Lovato, Little Big Town, John Legend to Pay Tribute to the Bee GeesBarry Gibb of the Bee Gees will perform at the event as well.
James Corden, Adele, Gaga, Mariah, More Sing 'All I Want for Christmas is You'The video starts out with Corden and Mariah discussing her favorite holiday. From there, we get a who's who of pop stars (and the Red Hot Chili Peppers) jamming to Mariah.

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