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LOS ANGELES, CA - FEBRUARY 10: Singers Katy Perry, John Mayer, and actress Allison Williams attend the 55th Annual GRAMMY Awards at STAPLES Center on February 10, 2013 in Los Angeles, California. (Photo by Lester Cohen/WireImage)

LOS ANGELES, CA - FEBRUARY 10: Singers Katy Perry, John Mayer, and actress Allison Williams attend the 55th Annual GRAMMY Awards at STAPLES Center on February 10, 2013 in Los Angeles, California.  (Photo by Lester Cohen/WireImage)