A man has been arrested following the stabbing of a party-goer last night at an event hosted by bisexual singer Jessie J.

Following the singer’s performance at the Blackberry gig in central London last night, a 25-year-old man reportedly stabbed another man in the neck.

The victim was hospitalised after he was attacked with the broken bottle and is said to be in a serious condition.

PinkNews.co.uk founder and Channel 4 technology correspondent Benjamin Cohen attended the party and described chaotic scenes after the man had collapsed in a pool of blood.

He said: “Everyone was trying to leave the club at the same time. The organisers weren’t geared up for it and there was a huge rush to get to the cloakroom.

“There were people crying and many were being sick, whether from the blood or the alcohol.”

The incident took place at Bankside Vaults on Southwark Street at about 11.40pm and police reportedly kept party-goers at the venue for questioning.

Jessie J tweeted this morning: “My thoughts are with the person who was seriously injured last night at the blackberry bbm party. So sad. I really hope they are ok.”

Scotland Yard said today: “At around 12.07am the ambulance service called police regarding a man injured in a club off Southwark Street.

“He is thought to be in his 30s and has been taken to hospital in a serious condition.

“The victim is thought to have been injured with a bottle. One man has been arrested and is in custody.”

The 25-year-old man has not been charged.