The epic moment went down when Madge performed "Ghost Town" from her new Rebel Heart album. She surprised everyone when Taylor joined her on stage for the acoustic performance. It was such an awesome women-kick-ass moment. We fangirl'd like no other...
Oh, and that was just the beginning of Taylor's night. She ended up leaving the awards show as the big winner, and even had some cute moments with Justin Timberlake in the audience.
Watch the two ladies get down in the video below. What do you think of their performance?
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Gallery | 2015 iHeartRadio Awards Red Carpet Arrivals