By People.com
Updated Nov 09, 2015 @ 7:45 am
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Forget about Taylor Swift's squad, Madonna's Rebel Heart tour is quickly racking up an impressive list of celebrity cameos. The latest star to make an appearance? Oscar-nominated actress Jessica Chastain, who joined the Queen of Pop on the stage to give her a spanking.

Chastain, 38, joined Madonna, 57, during a performance of "Unapologetic Bitch" in Prague on Saturday night. The pair strutted down the stage hand-in-hand before Madge led Chastain to the main stage and the actress unleashed her impressive dance moves. Then Chastain delivered a few taps on Madonna's bottom while she crawled on the floor underneath her.

"You were a very good bitch," Madonna told Chastain onstage after the song was over.

"I gave Madonna a spanking & Ive a video to prove it," the actress wrote on her Facebook page. She also shared an onstage shot from the night, writing, "The moment right before @madonna handed me a banana. The fkn QUEEN."

Previous guests on Madonna's stage include Amy Schumer and Katy Perry, although they both got spanked rather than being given the chance to spank Madge themselves.

This article originally appeared on People. For more stories like this, visit people.com.