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And the special guest is... Niall Horan!

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...

And, then, ALL OF A SUDDEN...

No. Words.

We hope you're alright, Katie!

It was the first-ever live performance of This Town

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Niall Horan - This Town (Radio 1's Teen Awards 2016)

The One Direction star keeps it acoustic with a brand new ballad.

Awwwwwwww!

Looks like a massive YES from over here

You weren't the only one, Caitlin!

This is still sinking in!