(Huffington Post) Sources told Us Weekly that Perry "doesn't approve" of Rihanna's decision to get romantically involved with Brown again, and their friendship has suffered because of it.
This isn't the first time we've heard reports that Perry and Rihanna have let Brown come between them. In November, the New York Daily News reported that the two were "barely talking."
At the time, a source close to Perry revealed "there has been tension" between the pop stars since Rihanna reunited with Brown, and noted that Rihanna even skipped out on Perry's Halloween party. Perry, like many others, fear that Rihanna is "making a huge mistake and doesn’t want to be part of it," revealed the insider.
Read the whole story at http://www.huffingtonpost.com/2013/02/14/katy-perry-rihanna-dating-chris-brown_n_2685591.html