Christina Aguilera & Cee Lo Green duet released

Christina Aguilera and Cee Lo Green track has surfaced on line.
The duet is called 'Nasty' and was recorded before the pair both became coaches on NBC's The Voice.
Green recently revealed that they had recorded a track together: "Christina's just like the best to me," he told Late Night with Jimmy Fallon. 
"We did a song together, a few years ago. 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."
Aguilera had previously announced her desire to work with Green.