Katy Perry is a flirty girl, but that doesn't mean she's dating every guy she comes across. That goes for Robert Pattinson and her ex-boyfriend, John Mayer. According to Us Weekly, John was one of Katy's guests at a May 27 barbecue party at her Hollywood Hills home. Other partygoers reportedly included Girls star Allison Williams, Mindy Kaling, BJ Novack, Beth Behrs, and more — but no mention of Rob. Apparently John and Katy are still on very good terms after their split. "They seem to be...
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