Miley Cyrus has a very special guest for her upcoming "Unplugged" performance on MTV -- and it's none other than the queen of pop herself, Madonna!
E! News reports that both pop stars were spotted rehearsing their collaboration on a sound stage in Hollywood on Monday.
"The performance will showcase a more intimate side of Cyrus and feature surprise guests for an unexpected re-invention of the songs that have defined her career, including several from her No. 1 critically acclaimed album, Bangerz," MTV said in a press release.