Katy Perry and Rihanna falling out about a boy, surely not? Well yes that's what the latest report out there claims with allegations the Prism babe flipped out when Ri revealed she wanted to duet with John Mayer.
Mayer of course is Perry's on/off ex and despite claims she's moved on with DJ Diplo she apparently wasn't impressed that the Diamonds singer was planning on working with the rocker on a new track.
"Katy's been left shocked and hurt after finding out John and Rihanna met up at an LA recording studio two weeks ago before having dinner," a source apparently told Now magazine,

"Rihanna asked John to sing vocals on a new track," the insider added.
"But Katy's flipped out and told her best mate she's gone one step too far this time."
Mayer isn't really RiRi's style so we doubt she'd be pushing for a collaboration and seeing as though she was spotted partying with Perry last week in New York we think this story is probably not true.
The ladies are known to have a fiery relationship though, with Katy making her feelings clear she wasn't happy when the Stay singer hooked back up with Chris Brown last year.
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