Actress Jessica Chastain spanked pop icon Madonna while onstage during the "Rebel Heart" tour stop in Prague on Saturday night, Entertainment Weekly reported. The "Crimson Peak" star joined the legendary singer as a guest onstage where Chastain danced along to Madge's song, "Unapologetic B---h."

"I gave Madonna a spanking & Ive a video to prove it. ‪#‎rebelheart ‪#‎unapologeticb---h," the redheaded "Interstellar" star bragged on Facebook along with fan-shot footage.

In the clip, Chastain is seeing strutting down an illuminated catwalk stage in the O2 Arena right next to the "Material Girl" herself, flanked by a group of male dancers dressed in black slacks, white button-down shirts and tail coats. Chastain wore black pants with black boots and a black lace bra under a sheer black top. Madonna wore a 1920s-inspired look of a black body suit with a sparkling silver fringe skirt and a silver fringe top draped over her shoulders.

The ladies danced their way down to the main stage and Madonna gave Chastain the spotlight for a dance solo.

"Alright Jessica, drop it like it's hot baby," Madonna said before she dropped down on all fours. Chastain bent forward and spanked the pop star as the grand finale for the performance.

“Tonights Sexy and Beautiful Unapologetic B---h. Thank you Jessica Chastain‼ Thank you Prague! #rebelhearttour,” Madonna later wrote in a caption on Instagram along with a shot of Chastain’s dance solo.

See Madonna’s Instagram post and watch the fan-shot footage from the performance below.