'No More Teens': Niall Horan Waves Goodbye To Teenage Years As He Turns 20

Niall Horan may be the most adorable member of One Direction but the star is finally blossoming into a young man after leaving his teenage years behind and turning 20 years old today.

The One Direction star is currently in Australia so celebrated his special day earlier than he would have back in the UK, so took it upon himself to share the news with his fans and followers on Twitter across the world.

"Yesss ! I'm 20 ! Wohooo ! No more teens!" the 'Best Song Ever' star tweeted.

Whilst Niall may have made the announcement in the early hours of this morning, his 1D bandmates - Harry Styles, Zayn Malik, Liam Payne and Louis Tomlinson - are yet to wish Niall a happy birthday but we don't doubt that the boys will soon be showing Niall some birthday love when they wake up!

Niall is no longer a teenager! (WENN)

Meanwhile, Niall, who is believed to have landed Down Under on Monday was greeted by fans as he touched down. Documenting their sighting of Niall, a fan posted on Twitter:

"Niall is in Melbourne and I just saw him in the city!! Everyone was freaking out!! Shook his hand. Nice guy."

Whilst One Direction's tour in Australia doesn't kick off until later this month, Niall's early arrival in Oz could be because he wants to visit relatives who live there, according to the Australian Herald.

Meanwhile, it appears Niall may have a "secret girlfriend" according to the manager of One Direction's personal trainer Mark Jarvis, Ramzy Khachnik who reportedly spilt all the beans to a Yahoo Omg source saying: ''All the others have had secret girlfriends except Harry, Niall has one too but I don’t know who it is.''

Amid the mystery, Liam recently told Magic FM: "Niall Horan's actually a secret ladies' man, he gets about bless him." Louis added:

"Yeah he is a bit of a secret ladies' man...He's just too cute so you don't see it coming."

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