Kristen Bell showed off her rock star skills on TV on Halloween night (31Oct17) by performing a medley of Frozen tune Do You Wanna Build a Snowman? and Metallica's Enter Sandman.

The actress also rocked out dressed as Tom Selleck's Magnum P.I. character with a costumed Dave Grohl.

The Foo Fighters star welcomed the actress to the Jimmy Kimmel Live! studio as he stood in for the absent host, dressed up as David Letterman.

Bell arrived wearing jeans, sneakers, a wig, and a Hawaiian shirt, sporting Selleck's trademark mustache and hairy chest, to promote her new film Bad Mom's Christmas.

Expressing a desire to "jam" with his guest, the stand-in host asked Kristen if she'd like to perform, and she agreed to perform the song she sang in animated Disney film Frozen.

After starting out sweetly, Grohl took over the house band's drum kit and Bell started rocking out, adding Enter Sandman to her set and growling through the lyrics.