Britney Spears won't be pleased to hear that tracks from her new album Circus have been leaked on YouTube.

The pop princess - whose album is set to hit stores on December 2 - made it to number four this week in the UK charts with Womanizer.

And now - as she rides the success of her so-called comeback single - Britney faces the prospect of the whole album being available nearly a month before its official release.

The tracks available to listen to are: Out From Under, Unusual You and previously streamed songs Circus, Kill the Lights and If U Seek Amy.

Listen to the tracks below

Circus

If U Seek Amy

Six new tracks