The Judges on ‘The Voice’ Sing Karaoke [VIDEO]

Blake, Adam, Gwen, and Pharrell all stopped by 'The Tonight Show Starring Jimmy Fallon' to play a rousing game of 'Spin the Microphone," and the results were hilarious.

Adam Levine singing Britney Spears, Blake Shelton singing Drake... so many interesting things happened on "The Tonight Show" this week when the cast of "The Voice" joined Jimmy Fallon for 'Spin the Microphone.' It's a pretty long video, but it is worth the watch! Check it out: