Niall Horan's in the US with One Direction

It seems like just yesterday that the baby-faced One Direction boys auditioned for The X Factor, but they've done a lot of growing up since then - especially Niall Horan

The Irish cutie - who's currently causing chaos in the States with his 1D band mates - has well and truly gone from being a boy to a man.

'Im a big boy now, and i need a shave,' Tweeted Niall, 18, to his 1,672,693 followers.

And unsurprisingly, the singer's revelation sent the Twitterverse into a frenzy with many fans trying to get #NiallNeedAShave trending.

Aww, we love seeing 1D mature - just don't go wearing your granddad's slippers and listening to classical music just yet, Niall!

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Carl Smith