Mariah Carey, Adele, more sing "All I Want for Christmas" on "Carpool Karaoke"

Christmas came early on the “Late Late Show.”James Corden dropped a surprise “Carpool Karaoke” with an all-star cast, starting with Mariah Carey to sing none other than “All I Want for Christmas.”Carey has a special connection with “Carpool Karaoke”: She was the first musician to do the segment with Corden.“There wasn’t anyone who would do it, and then there was a chance meeting with Mariah Carey, and she said, ‘OK, I’ll do