LOS ANGELES, CALIFORNIA AND NEW YORK CITY, NEW YORK UNITED STATES (HOLLYWOODTV) - Another day in Hollywood another Twitter war. This time it is pop singer Rihanna vs Joan Rivers. Rihanna did not find Joan funny when she called her and 'idiot" for saying she still had feeling for Chris Brown during an interview with Oprah. Joan wrote on Twitter "Now it's my turn to slap her." Rihanna quickly responded on Twitter saying "@Joan_Rivers wow u really do get slow when you're old huh?" Joan responded back "Honey, @rihanna, everyone knows: If he hit you once, he'll'' hit you again." Rihanna vs Joan Rivers our money is on Joan.

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