James Corden wrapped up a year of Carpool Karaoke with a star studded Christmas song. Katy Perry, Usher, Bruno Mars, The Foo Fighters, Miley Cyrus, Pink, Fifth Harmony, Sam Smith, Kelly Clarkson and Ed Sheehan joined him and bandleader Reggie Watts for a singalong to Mariah Carey’s cover of “Santa Claus Is Comin’ to Town.”
