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Zac Efron 's "High School Musical" days might be long gone ... but we're thinking there's still plenty of good vibes on his side, because he's celebrating his 38th birthday on Saturday!

We figured it'd be a good idea to whip up a little gallery of the former Disney star's hottest shots and see how he went from a teenage dream to a Hollywood heartthrob in just a few years!

We hope your day's just as spectacular as Zac's has to be ... and not nearly as hard as his biceps!

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