Chris Brown’s Mystery Blonde — ‘I Don’t Go For Black Guys’

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The mystery blonde who”s been accused of destroying Chris Brown“s relationship with Rihanna isn”t exactly a threat … because she says she prefers vanilla over chocolate.

22-year-old Keisha Kimball — a waitress at L.A.”s Playhouse nightclub — was photographed holding CB”s hand last Saturday inside the club … and now she”s being blamed for Chris and Rihanna breaking up.

But Keisha tells our sources, “I am always Chris’ waitress. I know him and am friends with his friends. Nothing has ever happened. I just work there. In the photos, he was handing me a bottle to drink out of. Of course people are going to twist it another way. I don’t go for black guys.”

She adds, “Whatever is going on between Rihanna and Chris Brown is between them. I’m not trying to be a home wrecker.”

And get this … Keisha says CB is normally a great tipper, but last weekend he stiffed her … in the gratuity department of course.

As for the CB/Rihanna breakup rumors … our sources say they”re true … but it”s nothing out of the ordinary for the on-again-off-again couple.

We”re told Brown and Rihanna break up like this on a regular basis — and things go back on track just as quickly as they derail.