Cee Lo Green and Christina Aguilera duet appears online

Cee Lo Green and Christina Aguilera’s duet 'Nasty' has seemingly appeared online.

Green recently confirmed the existence of the track on the Late Night With Jimmy Fallon TV show saying: "It actually was supposed to make the Burlesque soundtrack, but it didn’t make it. I’ve been seeing people tweeting about it lately, so I guess they’re going to release it."

Despite Green's words the origin of the track has been debated on both artists' fansites, with some on Afterld.com claiming it was recorded in 2005/6 and others on Ceelogreencentral.com that it is a newly-recorded track. Click below to hear it.

Aguilera meanwhile recently reunited with DJ Premier, the producer behind much of 2006's 'Back To Basics' album. Premier tweeted from Twitter/realdjpremier: “We are gonna work on her new LP… she’s ready to start." The new album is expected to be released in 2012 and will be the follow-up to 2010’s ’Bionic’.

Green and Aguilera are both judges on US reality show The Voice.