cyrusmadge460.jpgGetty Images for MTV

This doesn't surprise us!

Miley Cyrus' Unplugged MTV special aired last night, and although most young pop stars would have been intimidated to perform with the one-and-only Madonna, the 21-year-old seemed at ease and even took the liberty of tapping the icon's behind!

"I SPANKED @Madonna (hard) (and she liked it)," she tweeted.

The "Wrecking Ball" singer and Queen Madge belted out some of the biggest hits from both of their various albums, and let's just say the twerking queen was starstruck by the pop icon!

"That was pretty f**king cool, you guys. It sounds super-lame, but as a pop star it's pretty cool performing with Madonna... Today was one of those days that it was really easy to get out of bed, put on a bikini and sing with Madonna," Miss Cyrus told the crowd.

The whole night was a Western-theme in honor of the Tennessee native!