They both delivered impressive performances, but there could only be one Lipmaster.

Lip Sync Battle is TV's newest craze. The Spike TV show proves what we were all thinking: that the only thing holding back singing competition shows was that people were actually singing in them. Last week we showed you Anne Hathaway's majestic version of Miley Cyrus's "Wrecking Ball." This week, another actress stole our hearts: America's sweetheart Anna Kendrick (who shares my birthday, but that's not relevant).

Kendrick's opponent, John Krasinski, went first, with a gender-bending, glittery interpretation of Tina Turner's "Proud Mary." The crowd loved it, but from the moment Kendrick took the stage to perform Jennifer Lopez's "Booty," bringing a cadre of backup dancers and expert choreography, even Kransinski knew the story. Turning to host LL Cool J, he said, "I'm dead." And that was before this cameo:

Sources: Spike