Just five years ago Niall Horan was auditioned for The X factor at the tender age of 16!

Now finally at 21 , Niall celebrated his birthday at the Rose Bowl stadium in LA with nearly 100,000 fans singing happy birthday to him.

As well as encouraging the entire crowd to sing to Niall , Harry also paid tribute to his Irish pal with a touching speech about young Niall, potatoes, and tractors, resulting in a bashful Niall re-acquainting himself with his Irish roots in time to do a little jig as everybody sang to Niall.

One Direction’s stylist and long time friend, Lou Teasdale, shared a sneaky snapshot of the now-21-year old with a host of green, white, and orange balloons just before he went on stage alongside the caption: “I’m Irish. It’s my birthday.”

She also posted an absolutely adorable photo of Niall with her three-year-old daughter, Lux.

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Rochelle and Marvin Humes also tweeted their best wishes to the Irish popstar, with Rochelle calling him her ‘son’ and, of course, Simon Cowell sent out a special birthday tweet to his protege, revealing that Niall is still “the same fun kind guy” he met all those years ago.

Liam Payne was another one quick to share his love and send his well wishes by uploading a brilliant video, wishing his bandmate – who he describes as ‘a big fan’ of the band – a happy birthday