With Jimmy Kimmel out this week on family business, guest hosts have been holding down the fort. On Halloween, rock star Dave Grohl stepped in, dressed like David Letterman, to handle business. One of his guests was Kristen Bell. When Dave told Bell how much his kids loved her, they decided to perform the Frozen hit " Do You Wanna Build A Snowman."
But this isn't your kid's favorite version of the song...