Katy Perry Sensibly Disapproves of BFF Rihanna Dating Chris Brown

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Photo: Stephane Cardinale/Corbis

Rihanna's reunion with Chris Brown is reportedly coming between her and bestie Katy Perry. "They aren't tight anymore because Katy doesn't approve of Rihanna dating Chris Brown," says Us's source of the distance the two kept at the Grammys. And when the chick dating John Mayer doesn't approve of your boyfriend, that's when you know it's bad.