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6. Zac Efron

It’s hard to believe the High School Musical hunk was once a skinny nerd about as far from the cool crowd as it gets. We think he looked adorable with his gap toothed smile at the Thunderbirds premier back in 2004. However, with a little orthodonture, a better haircut and some muscle definition, he grew up to be a pin-up star that makes girls of all ages swoon. The gap is gone and his smile lights up the room.

Zac Efron young
Tinseltown / shutterstock.com
Zac Efron
Featureflash / shutterstock.com

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