Rihanna was forced to seek medical attention after being assaulted by a man.
The singer was targeted in an unprovoked attack by a man, who hurled a bottle of Lucozade at her, while leaving exclusive London nightclub The Box with her model pal Cara Delevingne on Saturday night.
The force of the glass bottle caused the 24-year-old star to fall and cut her knee.
Her bodyguard's leg was also said to have been injured as he attempted to catch her attacker, who allegedly shouted something about Rihanna's boyfriend Chris Brown before throwing the bottle at her.
The 23-year-old R&B star is still on supervised probation for beating her in 2009.
"Rihanna's bodyguard immediately went after the crazed fan but hurt his leg going after the subject," according to MediaTakeOut.
"Rih's guard was taken to a London hospital for treatment, and the mad man is still on the loose."
Rihanna was in London to launch her fashion line for River Island at London Fashion Week yesterday.
Meanwhile, Rihanna's father, Ronald Fenty, thinks Chris Brown deserves a second chance and has given their relationship his blessing.
"Chris made a mistake ... a terrible one. But I'm a great believer that everybody deserves a second chance and Chris is no different," he said.
The on/off couple have recently been getting close again after much speculation and they look to have reconciled.
According to the Sunday Mirror newspaper, Ronald said that if Rihanna was happy, he was too, and even suggested Chris had "always been very polite" to him.
"Everybody goes wrong in life. I certainly have. But it is about how you come back and live your life which is important," Ronald said.
"And as long as she is happy then so am I. Everybody has had their say about her and Chris but it is up to her to find her own way.
"Chris has always been very polite and kind to me, and treated me with respect. That's all you can ask for from your daughter's boyfriend."
Rihanna recently confirmed the reunion and said she could "handle" the backlash for taking him back.
"I decided it was more important for me to be happy, and I wasn't going to let anybody's opinion get in the way of that," she said.
"Even if it's a mistake, it's my mistake. After being tormented for so many years, being angry and dark, I'd rather just live my truth and take the backlash. I can handle it."