http://www.youtube.com/watch?v=HvRypx1lbR4
By: The Tonight Show Starring Jimmy Fallon
YouTube URL: http://www.youtube.com/watch?v=HvRypx1lbR4
YouTube Description:

Jimmy asks guests Will Ferrell and Kevin Hart to battle in an intense lip sync-off to songs like Beyoncé’s “Drunk in Love” and John Legend’s “All of Me.”

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The Tonight Show Starring Jimmy Fallon features hilarious highlights from the show including: comedy sketches, music parodies, celebrity interviews, ridiculous games, and, of course, Jimmy’s Thank You Notes and hashtags! You’ll also find behind the scenes videos and other great web exclusives.

Lip Sync Battle with Will Ferrell, Kevin Hart and Jimmy Fallon
http://www.youtube.com/fallontonight