Katy Perry and John Mayer have called it quits in their relationship, and the Dark Horse singer's friend Rihanna is reportedly causing some drama for her.

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On Thursday, Sugar Scape posted some information from a source claiming that Rihanna is talking to Mayer, which is making Perry not happy at all. Rihanna and Mayer were allegedly seen at LA's Soho House earlier this week looking pretty comfortable.

"John and Rihanna appeared very friendly in a corner," the source told "Heat." The two singers apparently hugged before Mayer left the lounge.

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This could be creating a stir for Perry since Rihanna supposedly only had negative things to say about Mayer.

"It seems like such a low blow," the source said. "Rihanna has been so negative about John, she's always told Katy he's not worth her tears. So to find out that Ri was being all friendly with him is incredibly hurtful. Katy sees it as a betrayal."

The insider also mentioned that the two singers have had a heated relationship where Perry lets the Diamonds singer take charge, which is another cause of drama.

"Katy's disgusted with her and is fed up with being hurt," the source added. "This year is all about making tough choices that are best for her in the long run, even if they're painful. It's the last time she'll let Rihanna hurt her."

Rihanna is rumored to be dating Drake while Perry allegedly had a fling with her friend DJ Diplo at Coachella.

Tags: Katy Perry John Mayer Rihanna