Did Katy Perry Break Up with BFF Rihanna Over Chris Brown? (We Wouldn't Blame Her)

Sources say the pop star pals "aren't tight anymore" because Perry "doesn't approve" of RiRi's reunion with Brown

Did you also think it was a little weird that Katy Perry chose to take Girls star Allison Williams to the Grammys as her date instead of boyfriend John Mayer or nominated 2012 date Rihanna? It turns out there might have been a little revenge scheme going on here, according to some sources.

According to reports, Perry isn't happy that Rihanna is back with Chris Brown, the man who was accused of beating her only four years ago. An insider tells Us Weekly that Perry and Rihanna's relationship has suffered since the "Stay" singer reunited with Brown.

"They aren't tight anymore because Katy doesn't approve of Rihanna dating Chris Brown," a source says.

Because of the rift in their friendship, Rihanna and Perry were reportedly seated far away from one another at the Grammys. Shots of the audience show that Perry and Williams were seated in one area of the Staples Center, while Brown and RiRi were somewhere else entirely.

That doesn't seem to be affecting Rihanna, though. She and Brown were very cute and cuddly throughout the night at the awards show, and later were seen "getting very affectionate" at the Zing Vodka Post-Grammy Party.

In the May 2012 issue of Elle, Perry and Rihanna revealed how they became fast friends. It all started when Perry complimented Rihanna on her Valentino purse, and Rihanna promised to send her one of her own -- and actually followed through.

"I thought, 'Wow this is a woman of her word,'" Perry said at the time. Rihanna added, "I'll tell you, you do not find people like [Perry] in this industry. She's gorgeous, charming and so unedited it's scary. That's what intrigued me most when I first met her: She said it like she saw it. I trust people like that. I feel safe around people who tell me the [bleeped]-up [bleep], because I know they'll always tell me the truth."

Maybe she didn't like the truth this time around.

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