Rihanna celebrates London Fashion week debut with bloody knee

Rihanna was left bleeding on a night out with party-girl Cara Delvingne after being bottled by a crazed fan who 'screamed at her about Chris Brown'.

The Bajan singer ended her night at The Box nightclub with a cut knee after being 'assaulted' by the stranger, who hurled abuse at her regarding her union with Brown, outside the exclusive nightspot.

According to eye-witnesses, the injury came after the unidentified fan threw a bottle of Lucozade at the singer, before flinging a stream of insults about her on-off boyfriend.

Ouch! Rihanna touches her leg where it was grazed, as if it had only just happened

In the commotion, Rihanna fell against a shop shutter and grazed her knee.

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

The S&M singer is currently in the capital for London Fashion Week where she presented her first clothing collection for high street behemoth River Island.

Rihanna enjoyed a night of clubbing with Cara Delevingne on Saturday following her designer debut.

The 24-year-old emerged from trendy venue The Box in England’s capital city looking well held together in the same ensemble she donned for her catwalk presentation.

Where did that come from: Rihanna investigated the small cut as she left the club