Fans of 'The Voice' are getting a special treat this week, as a studio collaboration between Christina Aguilera and Cee Lo Green -- recorded long before they signed up to co-star on their hit NBC series -- finally sees the light of day.

'Nasty' surfaced online recently, and when Green dropped by Jimmy Fallon's late-night show this week, the 'F--- You' hitmaker confirmed the existence of the previously unreleased recording, which you can hear below.

"We did a song together about a few years ago," Green said. "It actually was supposed to make the 'Burlesque' soundtrack, but it didn't make it...I've been seeing people tweet about it lately, so I think they're going to release it."

Since 'Dirrty' (2002) was one of the more notorious moments in Aguilera's career, it's understandable why a single titled 'Nasty' might have been reconsidered and shelved, particularly when the former Mouseketeer was attempting to launch her feature film career with 'Burlesque.' But the vocals are, no surprise, impressive. Listen to the track here: