LOS ANGELES, Nov 9 — Looks like Madonna just might be giving Taylor Swift a run for her money when it comes to getting celebrities to join her onstage at concerts.

The latest star to join Madge’s impressive list of celebrity cameos is Jessica Chastain who joined the Queen of Pop onstage in Prague on Saturday night.

And that was just the start of things as it got pretty steamy after that with Chastain having a go at spanking Madonna. During a performance of “Unapologetic B***h”, she made sure to break out her sexiest dance moves before delivering a few taps on Madonna’s bottom.

“The Martian” star is the latest in a string of celebs to join Madonna onstage during her Rebel Heart Tour, with Katy Perry and Amy Schumer already doing the honours earlier.

“I gave Madonna a spanking & Ive a video to prove it. #rebelheart #unapologeticb***h,” Chastain wrote on Facebook afterwards along with a link to a YouTube video.

Madonna also shared an Instagram snap from the concert with the caption: “Tonights Sexy and Beautiful Unapologetic B***h. Thank you Jessica Chastain. Thank you Prague!”