Revealed: Take a look at the pink hair for a clue. It's Katy Perry, who picked up this mask while she was in Brazil for Rock in Rio in 2011. The singer has been nominated every year for a Grammy since her 2009 hit, "I Kissed a Girl." At this year's Grammys, she could take home a win for "Roar."
These Grammy nominees and winners came up with some clever ways to avoid recognition. See how many you can identify behind the masks and glasses and costumes, and come back to Yahoo for full coverage of the Grammy Awards on Sunday, Jan. 26.