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Katy Perry's rebound after John Mayer -- Riff Raff?!!? Strange as it sounds ... we got the rapper talking all about his night with Katy -- but who brags about hooking up with one chick WHILE there's a different chick grinding on your crotch? Riff Raff, of course. Plus, Gwyneth Paltrow and Chris Martin's split has definitely been a long time coming -- and we have the proof in a real estate deal gone wrong. Did Gwyn shut down Chris' plan to move out a year ago? And, Charlie Sheen joins us -- he's mounting a full offensive against John Mayer over the singer's watch lawsuit ... and it gets nasty.