International singer and now fashion designer, Rihanna, started her weekend, in London, launching her fashion line and ended her weekend with a bloody knee.

USA Today reports that at about 3 a.m. Sunday, according to reports in the Daily News and Daily Mail, Rihanna was leaving the Box Nightclub in London with friends Melissa Forde and Cara Delevingne when a heckler began yelling at her about getting back together with Chris Brown. The heckler threw a bottle of Lucozade, a British energy drink, at Rihanna, 24.

She dodged the bottle, and in the chaos fell against a metal shop gate and cut her knee. Photos show her dabbing at the blood.

Her bodyguard also injured his leg amid the chaos and had to be taken to a hospital for treatment, reports the News.

The injury was deemed serious enough for her to require immediate medical attention, according to Media Take Out.

Rihanna tweeted about her London trip, but only to acknowledge a lengthy piece in The Sunday Times comparing her to Princess Diana.

"Just so happens I came home drunk to this in a pile of papers outside my hotel room! My lil Bajan behind ... When your face is pic-stitched to Princess Diana's on the cover of The Sunday Times.... I mean.. [sic]"

The singer has been receiving rave reviews for the designs she debuted over the weekend. She flew to London without boyfriend Chris Brown and the two spent Valentine's Day apart. Chris got himself busy with a scholarship he gave out at about the same time Rihanna flew to London.