This all-star 'Carpool Karaoke' special is all we want for Christmas

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All James Corden wanted for Christmas was to sing his favorite Mariah Carey holiday song with his idol, so he did. But on Thursday night (Dec. 15) The Late Late Show host also roped Lady Gaga, Elton John, Selena Gomez, Adele and a bunch of others into his all-star sing-along.

It all started out innocently enough, with Corden (in green) cruising around with Carey (barely in a red leather jacket) and the always-enthusiastic host thanking Mariah for helping him with his Xmas shopping. "What would be the best gift, what would you want for Christmas?" he asked the singer. "I don't know... I don't want to ask for something that's too expensive," she said. "Go on, put it out there," Corden encouraged.

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LONDON, ENGLAND - JULY 20: (EXCLUSIVE COVERAGE) (L-R) James Corden, David Walliams and Rob Brydon attend the closing night of 'Monty Python Live (Mostly)' at The O2 Arena on July 20, 2014 in London, England. (Photo by Dave J Hogan/Getty Images)
LONDON, ENGLAND - JULY 02: James Corden and Mark Ruffalo attends a Meet The Cast event for 'Begin Again' at Apple Store, Regent Street on July 2, 2014 in London, England. (Photo by Danny Martindale/WireImage)
NEW YORK, NY - JUNE 25: Actors James Corden, Keira Knightley, Mark Ruffalo and Adam Levine attend the 'Begin Again' premiere at SVA Theater on June 25, 2014 in New York City. (Photo by Andrew H. Walker/Getty Images)
LONDON, UNITED KINGDOM - MAY 18: James Corden arrives at the Arqiva British Academy Television Awards after party held at the Grosvenor house, Park Lane on May 18, 2014 in London, England. (Photo by Niki Nikolova/FilmMagic)
LONDON, ENGLAND - FEBRUARY 19: Host James Corden presents The BRIT Awards 2014 at 02 Arena on February 19, 2014 in London, England. (Photo by Matt Kent/WireImage)
LONDON, ENGLAND - FEBRUARY 17: Suki Waterhouse, Bradley Cooper, Julia Carey, James Corden and Anna Wintour attend the TOM FORD show at London Fashion Week AW14 at The Lindley Hall on February 17, 2014 in London, England. (Photo by Nick Harvey/WireImage)
LONDON, ENGLAND - FEBRUARY 17: (L to R) James Corden, Anna Wintour and Bradley Cooper attend the TOM FORD show at London Fashion Week AW14 at The Lindley Hall on February 17, 2014 in London, England. (Photo by David M. Benett/Getty Images)
LONDON, UNITED KINGDOM - OCTOBER 22: Chris Pine and James Corden at the Groucho club on October 22, 2013 in London, England. (Photo by Mark Robert Milan/FilmMagic)
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"I want you to sing my song, 'All I Want for Christmas is You,'" she said. Have you met James? Corden of course didn't miss a beat, busting into the seasonal classic for a duet with MC that morphed into verses with pretty much everyone who has done "Carpool" this year, including Demi Lovato, Gwen Stefani, Coldplay's Chris Martin, Nick Jonas and the Red Hot Chili Peppers. It was epic.

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