Madonna (@madonna on Instagram)

Ariana Grande was the latest celeb to come out as a surprise guest during Madonna’s Rebel Heart tour, gracing the stage in Miami’s American Airlines Arena to dance around during “Unapologetic Bitch” on Sunday night (Jan. 24).

“I am dead. @madonna thank you for the spanking & the banana. #rebelheart #forever #unapologeticbitches,” Grande posted on Instagram after the affair. Madonna posted in turn, “Kewtest Unapologetic Bitch EVER!! Thanks Ariana!!! Tonight was so much FUN!”

There are only two more North American dates left on the Rebel Heart tour, as Madonna wraps up in Puerto Rico on Thursday (Jan. 28). She’ll spend February and March in Asia, New Zealand and Australia.