Host Dwayne Johnson; Katy Perry performs.

Host Melissa McCarthy; HAIM performs.

Host Chris Pine; LCD Soundsystem performs.

Jimmy Fallon; Harry Styles performs.

Host Louis C.K.; The Chainsmokers perform.

Host Scarlett Johansson; Lorde performs.

Octavia Spencer hosts; Father John Misty performs.

Alec Baldwin hosts; Ed Sheeran performs.

Kristen Stewart hosts; Alessia Cara performs.

Aziz Ansari hosts; Big Sean performs.

Felicity Jones hosts; Sturgill Simpson performs.

Casey Affleck hosts; Chance the Rapper performs.

Holiday-themed sketches.

John Cena hosts; Maren Morris performs.

Emma Stone hosts; Shawn Mendes performs.

A compilation of holiday sketches.

Kristen Wiig hosts; The xx performs.

Dave Chappelle hosts; A Tribe Called Quest performs.

Benedict Cumberbatch hosts; Solange performs.

Tom Hanks hosts; Lady Gaga performs.

Emily Blunt hosts; Bruno Mars performs.

Lin-Manuel Miranda hosts; Twenty One Pilots performs.

Margot Robbie hosts Saturday Night Live with musical guest The Weeknd.