Label 'upset by Burke demo leaks'

Two demos for Alexandra Burke's debut album have been leaked online, reportedly infuriating record label Syco.

According to The Sun, recordings of 'Overcome' and 'Perfect' were supposedly stolen by hackers who gained access to producers' computers.

A source said: "The leaked songs are very rough early demos which were recorded months ago. We don't even know yet if they will make the final cut.

"Label bosses are furious and everyone is in a panic. Sony have spent thousands of pounds over the past few weeks investigating the sources of the leaks."

They added: "We are now pretty close to nailing the people responsible but it's been a nightmare."

Fellow X Factor 2008 competitor Diana Vickers confirmed that one of her own tracks had been leaked online earlier this week.