Christina Aguilera`s new single leaks online

London: A demo version of pop star Christina Aguilera`s comeback single, `Your Body`, has leaked online.

The new song is a mid-tempo R&B dance song but is believed to be a demo and slower than the final version of the song, reported a website.

The 31-year-old singer has been shooting a music video this week for the single and has teased fans by posting images from the set on Twitter.

Aguilera has also dyed her hair deep purple for a photoshoot which was for the artwork for the new collection.

"It’s finally here - Music Video shoot day! Get ready guys!(sic)," she had posted.

The new track is a preview of Aguilera`s seventh album, which will be released this autumn.

The as-yet-untitled record will follow up to 2010`s `Bionic`, which was a commercial flop, although Aguilera`s profile was recently boosted when she appeared on Maroon 5`s huge `Moves Like Jagger` single.

She is also a mentor on the US version of `The Voice` and contributed a number of songs to the soundtrack to film `Burlesque`, which she also starred in and was a hit, selling over a million copies worldwide.