Happy 21st Birthday:See Pics of Niall Horan's Style Transformation

SEP 13, 2014

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Niall Horan is finally 21! To celebrate his birthday, we rounded up 21 photos – from his childhood to present day – that show his style transformation. As you'll see, the One Direction singer has changed so much ever since he was a little kid!

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Credit:Splash News

Credit: Getty