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Terrified Ronnie then wet himself, prompting a stunned Rihanna to rap, "Oh no, he (peed) himself."

Rihanna also scored fashion points with her medieval style - she wore a red chainmail breastplate and hood for one of her two performances. Among her band was Extreme rocker Nuno Bettencourt.

Many fans expected her to poke fun at Brown, who was charged with assault and sentenced to hard labour after attacking Rihanna during a fight in February (09).