8 February 2013 9:00 AM, PST | PEOPLE.com | See recent PEOPLE.com news »

The Grammy Awards will be a girls night out on Sunday for nominee Katy Perry, who has invited a surprising plus-one. Perry, 28, who is currently in a relationship with John Mayer, 35, plans to take gal pal and Girls star Allison Williams. Mayer, however, is expected to present at Sunday's show. The chicks-only night on the town was confirmed by Williams to host Anderson Cooper when she appeared on a Thursday episode of his Anderson Live talk show. "I am going to the Grammys and Katy Perry is my date," Williams said. "She's the hottest date. She's a friend of mine and she's nominated, »


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