Everyone knows it's not really Christmas until Mariah Carey's iconic "All I Want For Christmas Is You" starts playing everywhere, and if James Corden's latest Carpool Karaoke is any indication, it's officially time to celebrate the season!

The Late Late Show host gifted viewers with a holiday-themed Carpool Karaoke on Thursday (December 15), complete with not one, not two, but an assortment of celebrity musical guests—and all of them previous 2016 Carpool Karaoke participants.

From Lady Gaga to Adele to Gwen Stefani, the gang's (nearly!) all there to belt out Carey's contagious 1994 seasonal smash.

Watch Corden and his guests get into the Christmas spirit, above.

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