The eight minute 'teaser', published by an unofficial fan site, contains a number of tracks purported to be final edits from the album.

The package – which can be heard below – features Spears' new single 'Womanizer' and 'Kill The Lights', which is thought to be the second single.

As previously reported, 'Circus' is due to be released in the UK on December 1st, a day before the singer's 27th birthday.

Last week, Spears made a special appearance alongside Madonna in Los Angeles.

(by Jason Gregory)