Anne Hathaway's "Wrecking Ball" was great and all, but her Devil Wears Prada co-star Emily Blunt took things to another level on Lip Sync Battle.

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First, Blunt slayed by going full Janis Joplin for "Piece of My Heart."

And is if that wasn't enough, she also got down and dirty with Blackstreet's "No Diggity." Even LL Cool J couldn't hide his surprise at Blunt's perfect performance/lap dance.