• KATY & ALLISON photo | Allison Williams, Katy Perry

Credit: Stephen Lovekin/Getty

Published: Thursday February 26, 2015 06:00 AM EST



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.