The always opinionated Joan Rivers got into a bit of a war of words over Twitter with the equally outspoken Rihanna this past weekend. Now Rivers' "Fashion Police" co-star Kelly Osbourne has jumped in the ring with the feuding celebs ... and is picking sides!

It all started on Aug. 24 when Rivers issued her public reaction to Rihanna's confession from her "Oprah's Next Chapter" interview that she still loves her abusive ex-boyfriend Chris Brown. "Rihanna confessed to Oprah Winfrey that she still loves Chris Brown. Idiot! Now it's MY turn to slap her," Rivers tweeted.

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See Rihanna's Most Shocking Twitter and Facebook Photos

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Watch "Rihanna 'Unfollows' Chris Brown on Twitter

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