Christopher Polk/Getty Images for MTV

UPDATE: MTV confirmed Madonna is Miley Cyrus' special guest on tonight's broadcast of MTV Unplugged. Madge & Miley will perform a Country-Western-themed mashup of "We Can't Stop" and the 2000 single "Don't Tell Me." 

"I didn't expect Madonna to be necessarily down to do something like Unplugged with me," Cyrus told MTV. "So the fact that she's here doing this hoedown thing with me now is unbelievable. I'm so stoked."

We can also confirm that M&M will be showing plenty of tongue together Wednesday night.

Original Story: Miley Cyrus is taking the famed MTV Unplugged stage January 29, and according to E!'s Marc Malkin, she'll welcome a very special guest: Madonna

According to Malkin's sources, the two pop stars are currently rehearsing in Hollywood, and fans can expect a cameo from Madge herself during the special. MTV has not yet confirmed this.

Madonna recently made another surprise appearance at the 2014 GRAMMYs. She joined Macklemore onstage during their performance of "Same Love" while Queen Latifah officiated 33 marriages in the audience. More importantly, she also wore a grill on the red carpet. 

Given Miley's weird and racy promo pic for the special, we're sure she'll be wearing something tweet-worthy for the show. But Madonna is never one to be outdone. Did someone say pasties? (Hey, it could happen!)

Miley Cyrus' MTV Unplugged special airs January 29 at 9p/8c on MTV.