Katy Perry Says John Mayer Was Her Best Lover, and Josh Groban Is 'The One That Got Away'

During a segment of her Big Brother-like “Witness World Wide” livestream Sunday, Katy Perry was joined by cab driver James Corden for a game of “Spill Your Guts or Fill Your Guts,” which is sort of like WWHL’s “Plead the Fifth,” only you have to eat something disgusting like a pickled pig’s foot or cow tongue (I don’t…

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