A London event which Jessie J was set to perform at tonight (April 5) has been postponed after a man was stabbed at a similar event earlier in the week.

As previously reported, a man was stabbed at a BlackBerry sponsored event on April 3 which Jessie J had earlier performed at.

The man remains in a serious condition, with another man arrested over the incident.

The singer was set to perform tonight at a MasterCard sponsored event in London, but it has been postponed to June 12, according to reports.

A representative for the event said in a statement:

"In light of the events, and out of respect to the person that was injured, MasterCard and Universal music have taken the decision to postpone the Priceless gig."

Watch Jessie J speak about her new TV talent show The Voice below: