NEW YORK, NY - NOVEMBER 27: Katy Perry,and Allison Williams attend the Unicef SnowFlake Ball at Cipriani 42nd Street on November 27, 2012 in New York City. (Photo by Stephen Lovekin/Getty Images)
NEW YORK, NY - NOVEMBER 27: Katy Perry,and Allison Williams attend the Unicef SnowFlake Ball at Cipriani 42nd Street on November 27, 2012 in New York City. (Photo by Stephen Lovekin/Getty Images)