Miley Cyrus & Madonna Performing...Together!

Get ready for the pop music world to implode!

I can exclusively reveal that Miley Cyrus' surprise guest performer for her upcoming MTV Unplugged special is none other than Madonna!

Yes, Miley and Madonna singing together!

Sources tell me that the two were on a Hollywood soundstage earlier today rehearsing the collaboration.

 No word on which song exactly they'll be performing, but does it really matter? They could read the telephone book together and the world would watch and listen.

Miley Cyrus: MTV Unplugged tapes tomorrow (I'll be there!) and will air on the music network Wednesday night at 9 p.m.

"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 last week. "Miley and her fans have always had an intimate and direct connection through her music, personality and no-holds-barred attitude and the Unplugged stage will serve as the perfect platform for her to show viewers