Along side John was Anna Kendrick, who looks like she nails her performance of One Direction's "Steal My Girl," and Jennifer Lopez's "Booty." Jenny from the block also decides to make a surprise appearance to help Anne finish off the song.
Make sure to check out the show tonight on Spike TV at 10 p.m.!
John Krasinski shows some skin during 'Lip Sync Battle'
4. Stephen Merchant and Joseph Gordon Levitt join Fallon for this epic lip syncing battle.
Merchant kicks it off with a DJ Jazzy Jeff special "Boom Shake the Room." Merchant and John Krasinski actually created the lip syncing battle content with Emily Blunt, and later introduced it to Jimmy Fallon.
Fallon follows up with a comic lip sync "Don't You Want Me." Joseph Gordon-Levitt melts the hearts of girls everywhere with a performance of "Tiny Dancer" by Elton John.
Watch as the three compete for the title of lip sync champion.(HINT: Watch through JGL's second performance. Can you say amazing?)
3. Jimmy asks guests Gwen Stefani and Blake Shelton to battle in an epic lip sync-off to songs like "Burn" and "Endless Love," and this one definitely lives up to the EPIC classification.
Shelton steps up to the battle with "Puttin on the Ritz" by Taco. Fallon follows up with "Burn" by Ellie Goulding (strong choice, strong choice). Stefani performs Carly Rae Jepsen's "Call Me Maybe."
The second round of songs, however, is worth a close watch.
2. It's not hard to see Paul Rudd's comic genius in his lip sync mastery of Tina Turner's "You Better be Good to Me," but he really steps it up in his second song with Queen's "Don't Stop Me Now."
Fallon is pretty much blown away.
1. Jimmy Fallon opens with an amazing performance of Iggy Azalea's "Fancy." But Emma Stone fires back fast with Blues Traveler's "Hook," and Fallon is visibly impressed while he watches on the sidelines.
The two songs that come next, however, are definitely the top of the top when it comes to lip sync battle material. Fallon even tells Stone: "That was the best one that's ever been done on the show!"