Mariah, Lady Gaga and More Star in This Christmas Carpool Karaoke

We thought that Carpool Karaoke had peaked with Bruno Mars this week, but we had no idea what was in store for us. This is the most celeb-infused CK to date, with stars like Lady Gaga, Adele, Chris Martin, Sir Elton John, Selena Gomez and more singing “All I Want for Christmas is You.” Watch this and we guarantee you’ll get all the holiday feels.