James Corden and Reggie Watts wrap the 2017 year of Carpool Karaoke with a mashup of the Christmas classic "Santa Claus Is Comin' to Town" with Harry Styles, Katy Perry, Usher, Bruno Mars, The Foo Fighters, Miley Cyrus, P!nk, Sam Smith, Fifth Harmony, Ed Sheeran and Kelly Clarkson.
| Name | Type | Role | |
|---|---|---|---|
| Harry Styles | Guest Star | ||
| Bruno Mars | Guest Star | ||
| Foo Fighters | Guest Star | ||
| Miley Cyrus | Guest Star | ||
| P!nk | Guest Star | ||
| Fifth Harmony | Guest Star | ||
| Sam Smith | Guest Star | ||
| Katy Perry | Guest Star | ||
| Ed Sheeran | Guest Star | ||
| Reggie Watts | Guest Star | ||
| Usher | Guest Star | ||
| Kelly Clarkson | Guest Star |