Way back in October 2007, Lil Wayne said he had the perfect track for him and Eminem to get down on. At the time, Slim Shady was on hiatus from music.

But now, with an album already released this year and in the midst of completing another one, Em and Wayne have finally gotten together for a song. Sure, they both had verses on this year's "Forever," but that was a Drake track, and Wayne has said that he wanted Em on his own album.

According to Wayne's management, the new Weezy/Em song is called "Drop the World" and will be included on Rebirth, which is now due December 21. Also on December 21, Em will re-release Relapse, subtitled The Refill, and Relapse 2 is due sometime next year.

Amazon UK posted a track list for Rebirth on Monday (November 30), but Wayne's label would not confirm the lineup. That track list also includes collaborations with Nicki Minaj, Kevin Rudolf and Shanell.

Earlier this year, Em revealed he was definitely all for a collabo with Weezy F. Baby.

"There hasn't really necessarily been a time for me to go to collaborate and sh-- lately, because I been so locked down in the studio," Eminem said. "But I'm open for whatever. There's a lot of rappers in the game I respect, especially right now."