03/30/2015 09:29 am ET Updated Dec 06, 2017

Madonna And Taylor Swift Were Two Souls In A 'Ghosttown' At The iHeartRadio Music Awards

Christopher Polk/NBC via Getty Images

Sunday's iHeartRadio Music Awards teased a surprise during Madonna's performance, and a surprise she did deliver: Taylor Swift turned up to play acoustic guitar on Madonna's new single, "Ghosttown." With the duo starting side by side on stools, the number began as an intimate, light-some-candles-and-sway ballad and turned into an electrifying meeting of the souls -- specifically the souls of the biggest pop star of the moment and the biggest pop star of all time. Not just anyone can book Taylor Swift as a backup guitarist, after all.

Both singers posted joyful reactions on Instagram after the performance:

My new favorite guitar player! Thank you Taylor! Just you and I in a #ghostown ❤️#rebelhearts

A photo posted by Madonna (@madonna) on

I might be okay but I'm NOT FINE AT ALL. #MyFangirlLife #MadonnaAndTaylor

A photo posted by Taylor Swift (@taylorswift) on

Madonna reappeared shortly thereafter to present Swift with Song of the Year, which she won for "Shake It Off":




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