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Updated: Wed, 01 May 2013 15:15:00 GMT | By Felicity Thistlethwaite & Colleen Last
Lady Gaga and Perez Hilton: When celebrity friendships end

Rihanna and Katy Perry



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Rihanna apparently didn't approve of Katy Perry's wedding with Russell Brand, and then Katy wasn't happy when RiRi reunited with Chris Brown. They're still mates, but not as close as they once were.

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