Happy birthday, Niall Horan!

Niall is the last of One Direction to break through the "teen" years, as he turns the ripe old age of 20.

Where did the time go, oh little one?

Niall, who is currently celebrating his birthday in Australia, took to Twitter to cheer on his new decade, writing, "Yesss ! I'm 20 ! Wohooo ! No more teens!"

We'll be updating with birthday wishes from Harry Styles, Liam Payne, Zayn Malik and Louis Tomlinson soon enough.

No doubt they will have plenty to say about Niall's big day.

Harry tweeted: "Happy Birthday @NiallOfficial ... Behave yourself. All on red."

What do you think he's doing to celebrate his birthday?

Knowing Niall, probably eating...but we're sure he'll share some of his birthday fun on Twitter.

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