Maybe Niall isn't ready to leave his boy band days behind after all.

After slaying their American Music Awards performances last night,xxx full movies - free watch online and download pop heartthrobs Niall Horan and Shawn Mendes sat down together to sing Mendes' hit song, "Mercy," and it's almost as though the duo was meant to sing together all along.

Listen to their perfect harmony below.

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Can these two just be a boy band, please?