VIDEO : Watch Anne Hathaway Swing Epic 'Wrecking Ball' on 'Lip Sync Battle'

Anne Hathaway came in like a "Wrecking Ball" for Thursday's Lip Sync Battle versus Emily Blunt. But the grand finale ? a swing on an actual wrecking ball ? whips the crowd into a frenzy, leaving her opponent, and host LL Cool J, speechless on the sidelines. SiTo her credit, Blunt brings the soul-rock thunder with her performance of the Big Brother and the Holding Company version of "Piece of My Heart," getting in character as a fur coat-wearing Janis Joplin. But this round was an easy Hathaway K.O. Lip Sync Battle ? a spinoff of The Tonight Show's popular recurring segment where celebrities mime their favorite hits ? premiered last week on Spike, with Jimmy Fallon squaring off against Dwayne "The Rock" Johnson??