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.
| Name | Type | Role | |
|---|---|---|---|
| Iggy Azalea | Guest Star | ||
| Justin Bieber | Guest Star | ||
| Rod Stewart | Guest Star | ||
| Reggie Watts | Guest Star | ||
| Carrie Underwood | Guest Star | ||
| One Direction | Guest Star | ||
| Jason Derulo | Guest Star | ||
| Stevie Wonder | Guest Star |