Happy birthday, Zac Efron! The actor and TV personality turns 36 today, October 18, and it's clear to see that the American star has transformed quite a bit in his nearly two decades in the spotlight.
While Zac has solidified himself as a Hollywood heartthrob, thanks to his chiseled features and equally chiseled six pack, he's embraced some vastly different looks over the years for some of his roles while maintaining his natural charm.
Relive in photos some of the actor's biggest (and hottest) transformations over the years for his onscreen roles…
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