18 Things You Learn Following Katy Perry Around

Katy Perry doesn't have much to hide, and she's not exactly short on opinions. In hours of interviews for her latest Rolling Stone cover story (conducted during tour stops in New York, New Jersey and Montreal), she held herself back on precisely one subject: her now-defunct romance with John Mayer. ("I don't want to be rude to him and or what that was, because it always comes to bite me in the ass and I don't want to do that anymore.") But she had plenty to say about every other aspect of her life and work, which left plenty of......