Rihanna was ATTACKED last night in London by a CRAZED FAN. The fan, we’re told FLUNG A BOTTLE of a British softdrink called LUCOADE at Rihannna – while yelling SOMETHING about Chris Brown. The bottle caused Rihanna to STUMBLE into a metal drate – and SLICE OPEN HER LEG. But it didn’t end there. Rihanna’s bodyguard immediately WENT AFTER the crazed fan – but hurt his leg going after the subject. Rih’s guard was taken to a London hospital for treatment, and the MAD MAN is still on the loose.