Many celebrities were held by police officers to help with their inquires at the Blackberry BBM party held at London's Bankside Vaults, where two men became involved in an argument, before one of them plunged a broken bottle into the other man's neck.
It was reported that Jessie J was just coming off stage at the time of the stabbing at the event, which was to promote BlackBerry's instant messaging service.
This morning she took to Twitter to discuss the events of the previous night.
"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," she tweeted.
Many other celebrities had turned out for the event including newly pregnant Nicola McLean and The Only Way Is Essex's Joey Essex and Lydia Bright and rapper Wretch 32.
A Scotland Yard spokesman said: "A man in his 30s has been injured following an incident at a party in southeast London. It is believed he was attacked with a broken bottle and the man has suffered a neck injury.
"He is in an east London hospital, where his description is described as serious."
A man has reportedly been arrested and is in police custody.
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TOWIE's Lauren Goodger and Fazer from N-Dubz were among the celebrities caught up in a shocking scene of events after a man was stabbed at a party where Jessie J was performing last night.
Many...
TOWIE's Lauren Goodger and Fazer from N-Dubz were among the celebrities caught up in a shocking scene of events after a man was stabbed at a party where Jessie J was performing last night.
Many...
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