Kristen Bell sports Magnum PI mustache and chest hair

The Good Place's Kristen Bell and Foo Fighters frontman Dave Grohl were unrecognizable in their respective costumes on the Halloween episode of on Tuesday.

The 37-year-old mother-of-two - who found fame as teen detective Veronica Mars - sported a wig, mustache, chest hair, and Hawaiian shirt to better resemble Tom Selleck from CBS' Magnum, P.I.

And the 48-year-old guest host rocked a white short wig, burly beard, glasses, and a Letterman jacket to better transform into talk show legend David Letterman.

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Boo! The Good Place's Kristen Bell (R) and Foo Fighters frontman Dave Grohl (L) were unrecognizable in their costumes on the Halloween episode of Jimmy Kimmel Live

Boo! The Good Place's Kristen Bell (R) and Foo Fighters frontman Dave Grohl (L) were unrecognizable in their costumes on the Halloween episode of Jimmy Kimmel Live

'Being here with you it's kind of the biggest deal to my [three daughters Violet, 11; Harper, 8; Fifi, 3 - with wife Jordyn Blum],' Grohl gushed to Bell.

'If I were to, like, jam a song with you, I would become the coolest dad in the world. [Do You Want to Build a Snowman] is like my Highway to Hell, just so you know.'

After Kristen - who famously voiced Anna in Disney's Frozen - sang the first bar of the children's track, Dave jumped behind a drum kit and the house band played Metallica's Enter Sandman. 

Double take: The 37-year-old Veronica Mars alum sported a wig, mustache, chest hair, and Hawaiian shirt to better resemble Tom Selleck from CBS' Magnum, P.I.

Double take: The 37-year-old Veronica Mars alum sported a wig, mustache, chest hair, and Hawaiian shirt to better resemble Tom Selleck from CBS' Magnum, P.I.

Double take: The 37-year-old Veronica Mars alum sported a wig, mustache, chest hair, and Hawaiian shirt to better resemble Tom Selleck from CBS' Magnum, P.I.

Whoa! And the 48-year-old guest host rocked a white short wig, burly beard, glasses, and a Letterman jacket to better transform into talk show legend David Letterman

Whoa! And the 48-year-old guest host rocked a white short wig, burly beard, glasses, and a Letterman jacket to better transform into talk show legend David Letterman

Whoa! And the 48-year-old guest host rocked a white short wig, burly beard, glasses, and a Letterman jacket to better transform into talk show legend David Letterman

Grohl gushed to Bell: 'Being here with you it's kind of the biggest deal to my [three daughters Violet, 11; Harper, 8; Fifi, 3 - with wife Jordyn Blum]'

Grohl gushed to Bell: 'Being here with you it's kind of the biggest deal to my [three daughters Violet, 11; Harper, 8; Fifi, 3 - with wife Jordyn Blum]'

Dave added: 'If I were to, like, jam a song with you, I would become the coolest dad in the world. [Do You Want to Build a Snowman] is like my Highway to Hell, just so you know'

Dave added: 'If I were to, like, jam a song with you, I would become the coolest dad in the world. [Do You Want to Build a Snowman] is like my Highway to Hell, just so you know'

Metal version! After Kristen - who famously voiced Anna in Disney's Frozen - sang the first bar, Dave jumped behind a drum kit and the house band played Metallica's Enter Sandman

Metal version! After Kristen - who famously voiced Anna in Disney's Frozen - sang the first bar, Dave jumped behind a drum kit and the house band played Metallica's Enter Sandman

Yes! It was a sweet sight to hear the 15-time Grammy winner beating away 23 years after finding fame as the drummer for seminal grunge band, Nirvana

Yes! It was a sweet sight to hear the 15-time Grammy winner beating away 23 years after finding fame as the drummer for seminal grunge band, Nirvana

Yes! It was a sweet sight to hear the 15-time Grammy winner beating away 23 years after finding fame as the drummer for seminal grunge band, Nirvana

It was a sweet sight to hear the 15-time Grammy winner beating away 23 years after finding fame as the drummer for seminal grunge band, Nirvana.

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