James Corden and Reggie Watts kick off a Christmas edition of Carpool Karaoke singing "Joy to the World" with One Direction, Stevie Wonder, Iggy Azalea, Rod Stewart, Carrie Underwood, Jason Derulo and Justin Bieber.
James Corden and Reggie Watts kick off a Christmas edition of Carpool Karaoke singing "Joy to the World" with One Direction, Stevie Wonder, Iggy Azalea, Rod Stewart, Carrie Underwood, Jason Derulo and Justin Bieber.