A man in his thirties has been left in a serious condition after reportedly being stabbed in the neck at the Blackberry BBM party last night.

The stabbing occurred shortly after Jessie J finished her performance on stage at Pulse nightclub in Southwark, witnesses say there was a stampede to the cloakroom after a dispute broke out between two men ending with one of them being stabbed with a broken bottle.

Jessie J was performing at the event in Southwark

Police prevented guests from leaving the party until 1.50am as they investigated the incident and as a number of celebs were in attendance, such as Chipmunk, Wretch 32 and the TOWIE cast, many of them were stuck in the venue and made to give their details to the police as they left.

Scotland Yard said a 25-year-old suspect had been arrested on suspicion of assault and is in custody at a South London police station.

A man being arrested whilst Fazer gives his details to police

The party was hosted as an attempt to revitalise BlackBerry’s consumer division but we think it did the total opposite. Last year we all hated them for their three day shutdown and now a stabbing at their party? We think Blackberry should just admit defeat to the iPhone and call it a day.