Niall Horan and Shawn Mendes duet on 'Mercy'

We're physically incapable of typing.

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Niall Horan and Shawn Mendes
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Shawn Mendes and Niall Horan have been teasing a collaboration since approximately 884 B.C.

It's finally happened.

They've done Shawn's song 'Mercy.'

We've literally been rendered speechless.

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Blimey.

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