TV3.ie | Katy Perry 'upset by Rihanna' TV3.ie This year has already seen the singer split from her on/off boyfriend John Mayer for good, and apparently she is ready to make some other big decisions. Katy has long been friends with Rihanna, but after hearing the Barbadian singer had been seen looking ... Katy Perry 'disgusted' by Rihanna's friendship with John Mayer |