Madonna and Taylor Swift busted out a surprise duet [1] at this weekend's iHeartRadio Music Awards, performing Madonna [2]'s new single, "Ghosttown," from her new album, Rebel Heart. Madonna sang while a visibly stoked Swift played guitar, and at the end, they came together to rock out the big finish. It feels pretty meaningful to see two huge icons collaborating, so check out the video now and then watch Rihanna performing her new single [3]!