We Owe Mariah Carey BIG TIME

James Corden welcomes Mariah Carey as his guest for Episode 1,000, which is fitting as all of us owe a great deal to MC for agreeing to do the first-ever Carpool Karaoke. After Mariah locks in her look, she and James go back to the day they filmed Carpool, and we get the details about her new McDonald's menu, complete with must-have merch.

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Watch The Late Late Show with James Corden weeknights at 12:35 AM ET/11:35 PM CT. Only on CBS.

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Each week night, THE LATE LATE SHOW with JAMES CORDEN throws the ultimate late night after party with a mix of celebrity guests, edgy musical acts, games and sketches. Corden differentiates his show by offering viewers a peek behind-the-scenes into the green room, bringing all of his guests out at once and lending his musical and acting talents to various sketches. Additionally, bandleader Reggie Watts and the house band provide original, improvised music throughout the show. Since Corden took the reigns as host in March 2015, he has quickly become known for generating buzzworthy viral videos, such as Carpool Karaoke."