Katy Perry: Pissed At Rihanna For Working With John Mayer?

Katy Perry and Rihanna are BFFs type of show that just seem to hang out at award shows, but even that may not have regular slumber parties, that does not mean its okay for any of them to go and have other friends with exes.

 At least that's the message informs, Katy has given Rihanna after learning of the plans for a collaboration of John Mayer / Rihanna.

Katy, of course, is rumored to be devastated by their separation from Mayer and experts say it is close to finishing his friendship with Rihanna, as a result of planned recording session.

" Katy has been left shocked and hurt after hearing about John and Rihanna met in a recording studio in Los Angeles two weeks ago before dinner , " an anonymous source told the British tabloid Now.

“Rihanna asked John to sing background vocals on a new track," the source added. “But Katy flips out and told his best friend that has gone too far this time.”

Yes, the "source" in this drama based in LA is distinctly British, but the rumor is still plausible, however.

Rihanna done duets with a number of singers and if emotions are so raw and Katy have heard, it stands to reason that she would be upset to find out your best friend is working with his ex.

Katy is dating DJ Diplo these days and seems to have moved mostly, but Rihanna is definitely still violating code girl here.

Katy would say should take revenge for collaborating with ex Rihanna , but Chris Brown is in jail for the foreseeable future and it is difficult to make a duet through a plexiglass window .