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And the special guest is... Niall Horan!
![](https://ichef.bbci.co.uk/images/ic/256xn/p04cxtfj.jpg)
OMG! The show started with Niall Horan and it was a complete surprise (even though a lot of you were making some pretty good guesses on Twitter).
The One Direction superstar played his ace debut single, This Town, and I think we can say that you enjoyed it.
Here's what happened...
Hours before the show started you were preparing yourself - just in case
Uh oh! Tears alert!
Good guess, Tamara (*very* good guess)
Look who we spotted backstage...
![](https://ichef.bbci.co.uk/images/ic/256xn/p04cxf66.jpg)
And, then, ALL OF A SUDDEN...
No. Words.
We hope you're alright, Katie!
It was the first-ever live performance of This Town
![](https://ichef.bbci.co.uk/images/ic/480x270/p04cxjkh.jpg)
Niall Horan - This Town (Radio 1's Teen Awards 2016)
The One Direction star keeps it acoustic with a brand new ballad.