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  • KATY & ALLISON photo | Allison Williams, Katy Perry

Credit: Stephen Lovekin/Getty

Published: Wednesday April 10, 2013 06:00 AM EDT

2013

KATY & ALLISON

During her romance with John Mayer, Perry became fast friends with Girls star Williams, who dates Mayer's good pal Ricky Van Veen (got all that?). The singer even brought the actress as her date to the Grammys in February and partied with her after the show. "She's the hottest date," Williams said at the time.