"Me being here with you - it's the biggest deal to my kids", said Grohl, dressed up like retired late-night legend David Letterman.
The two chose to join forces and jam, with the Bad Moms Christmas star dedicating a performance of Do You Want to Build a Snowman? to Grohl's three daughters. "If I were to jam a song with you, I would become the coolest dad".
Amazon Prime Video now on Xbox One
Why it took so long to make the Prime Video app available to users in these countries is unknown, but at least the wait is over. Last December, Amazon Prime Video launched in more than 200 countries and territories around the globe.
Soon the whole studio band joined in, and the music grew heavier.
What followed was a mashup of "Do You Wanna Build a Snowman" with the rock group's 1991 classic "Enter Sandman".
Prior to the performance, Bell and Grohl discussed their costumes and Bell dressing up - at her daughter's request - as Frozen's Elsa, the sister of Ana, the character Bell played in the smash hit 2013 film.
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