But when he actress prepared to compete against her Devil Wears Prada co-star Anne Hathaway in Spike TV's Lip Sync Battle, she went a little overboard. "I've been super method about it. I've been screaming at everybody pretty much all day because I don't want a voice," she said in mock seriousness. "And I guarantee that Anne Hathaway is in full voice right now. Anne has a very, very secretive process."
Cut to the footage of Blunt trying on different glasses in her dressing room.