Katy Perry is having a turbulent time with her new bloke John Mayer. The couple had a bust-up after the MTV Video Music Awards on Thursday night in Los Angeles. There were already rumors that Katy and John were on the rocks — and they didn’t do much to stop them as they attended a bash at the Beverly Hills Hotel. A source said: “John and Katy had been to dinner at Italian restaurant Madeo before going to the party and something had clearly gone on. “When they turned up to the Esquire event, Katy was walking well in front of John and it was clear they had just had a fight. “Inside, their tempers were both boiling and they eventually disappeared to have it out in a private room away from other party-goers.”At least that stopped the others at the party feeling like they were reliving their parents’ rows. single We Are Never Ever Getting Back Together is rumoured to be written about him. If things don’t improve for Katy and John, she’ll be asking to record a cover of the track. “When they turned up to the Esquire event, Katy was walking well in front of John and it was clear they had just had a fight.