"Two souls in a ghost town, indeed!"

Madonna took the stage at the 2015 iHeart Radio Music Awards to perform her new apocalyptic Rebel Heart single, "Ghost Town," and guess who joined her on stage? This year's undeniable queen of pop, Taylor Swift. That's right. Taylor busted out a surprise performance at the awards show -- and showed off her guitar skills, no less.

Taylor has been basically ALLLL over this year's iHeartRadio Awards -- chilling with Innovator Award-winner, Justin Timberlake, and scoring the award for Best Lyrics (so far) -- so it was really no surprise that she collabed with Madge on stage. Except it was. An awesome surprise. These two ladies should definitely do a record together.

I mean, if Madonna can work with Mike Tyson...

Check out the girl-powered performance down there: