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LONDON - Rihanna successfully launched her new fashion line, River Island, on Saturday in London.

But after the show, the singer's celebration of the day was ruined.

A 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.

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.."