Katy Perry won't be hitting the Grammys red carpet with boyfriend John Mayer this Sunday; she'll be taking her "Girls" pal Allison Williams instead.
Williams, who stars in the HBO comedy series, confirmed her high-profile date to Anderson Cooper on Thursday's "Anderson Live!"
"I am going to the Grammys and Katy Perry is my date," she said. "She's the hottest date. She's a friend of mine and she's nominated, as she should be. I can't wait to go. Obviously she's awesome. She's the best."