JOAN RIVERS CALLS RIHANNA AN IDIOT ON TWITTER FOR LOVING CHRIS BROWN!

When Rihanna opened up to Oprah about her undying love for Chris Brown -- the vilified ex-boyfriend who beat her up on the eve of the 2009 Grammys -- the revelation left many fans and critics puzzled. Among them was comedian Joan Rivers, who's since instigated a Twitter war with the Bajan beauty.

"Rihanna confessed to Oprah Winfrey that she still loves Chris Brown," Rivers tweeted. "Idiot! Now it's MY turn to slap her."

Never one to back down from a good Twitter tussle, Ri responded with a dig against the 79-year-old comedy legend's age.

"@Joan_Rivers wow u really do get slow when you're old huh?" Rihanna tweeted, later deleting the message.

"Slap on some diapers," she added in a follow-up post, which she's opted not to take down.

Taking the high road and ending -- one hopes -- the skirmish on a concerned note, Rivers explained that she's looking out for the singer's well-being. She might also be looking out for her ratings, as she invited Ri to appear on her E! show.

"Honey, @Rihanna, everyone knows: If he hit you once, he'll hit you again," she tweeted. "Read the statistics. PS – Love to have you on Fashion Police!

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