Two generations of divas are colliding as Madonna has reportedly been booked as a guest performer for Miley Cyrus' 'MTV Unplugged' special.

Whoa, really?! That's a pretty big guest with whom Mi Cy will have to share the spotlight.

Miley tapes the special tonight (Jan. 28) and it airs tomorrow, Jan 29 at 9M ET on MTV.

According to E!, Her Madgesty and Miss Miley were reportedly rehearsing their collabo on a soundstage in Hollywood on Monday, Jan. 27. Like our minds aren't totes blown at the thought of this!

Details, such as which song the ladies will perform, are scarce. But that's secondary. All we know is that a Madge x Miley collabo could and should be pretty dope.

Madge has teamed up with current generation performers like Justin Timberlake and Nicki Minaj, and of course, Britney Spears. But Miley is pop music's loose cannon, and perhaps that is exactly why Madge has signed on.

Will you be tuning in tomorrow night?! PopCrushers? Smilers? Her Madgesty's subjects?