Jessie J has expressed her disappointment after her new album leaked online.

The singer is due to unleash 'Alive' on September 23 but it has found its way onto the internet illegally.

Taking to Twitter to talk about the news, the 'It's My Party' star suggested that the traditional idea of "mystery" and "big reveals" in music is dissipating as a result of the internet. She said:

"One day. Just one day. Something I work hard on will NOT be leaked... Smh."

Jessie J added: "The mystery in music is slowing disappearing. The big reveals don't happen anymore, everything is so immediate! Social networking just makes everything so accessible. Such a shame."

'Alive' is the second album release from the former Voice UK coach, following on from her 2011 debut 'Who You Are'.

Watch the video for Jessie J's 'It's My Party' below: