Rihanna was forced to seek medical attention after a crazed fan chucked a bottle at her while she was leaving super exclusive club The Box last night.
Rihanna had been out celebrating the launch of her first collection for River Island when her security failed to stop the fan lashing out.
Yeah, doesn't sound like much of a fan to us!
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Riri was smacked full force after a man chucked a full bottle of Lucozade at her as she exited the club with her new pal Cara Delevingne.
She was hit so hard she took a topple and ended up cutting her leg open on a metal drain.
According to MediaTakeOut.com: "The bottle caused Rihanna to stumble into a metal drain - and slice open her leg."
"Rihanna's bodyguard immediately went after the crazed fan but hurt his leg going after the subject."
The website added: "Rih's guard was taken to a London hospital for treatment, and the mad man is still on the loose."
We just hope someone manages to catch the Lucozade hurler, who knows which celeb he might target next?!