Watch the video here...
Niallers, we are feeling VERY jealous after seeing this.
Following Niall Horan bringing Dermot Kennedy out on one of his shows, Niall did one bigger...
Niall invited Shawn Mendes to join him on stage.
Following a hiatus from performing, it's safe to say, fans were VERY surprised.
The pair performed Shawn's hit song 'Treat Me Better'.
Watch the video here:

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