"I'm not going Vegas or anything like that," he told Entertainment Tonight at Thursday's premiere of High School Musical 3: Senior Year in L.A.
"I'm sure I'll have fun, but we're not going to go big," he said of his plans. "I'm going to lay low."
What does Efron's girlfriend - and HSM costar - Vanessa Hudgens have in store for her beau's big 2-1?
"It's a surprise," she told ET. "But a good one!"
See how Zac and Vanessa spend their date nights.
Efron's birthday month is sure to a busy one - his High School Musical 3: Senior Year opens nationwide next Friday.
Check out photos of the birthday boy through the years.
But Efron - Us' Hot Hollywood Star of the Year - confirms it's not about reviews or box office totals.
"It's never been about that for us," he said. "We're just having fun making movies."
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Zac Efron's 17 Again topped the box offices its opening weekend. Did you watch Efron's new movie?
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Comments (17)
Happy birthday! have a great day i love you soooooooooooooooooooooo much!!!!!!!!!you are sooooooooooo hot!!!!!!!!!!!!!!!!!!!! and cute!!!!!!!!!!!! i love you...
Happy birthday! have a great day i love you soooooooooooooooooooooo much!!!!!!!!!you are sooooooooooo hot!!!!!!!!!!!!!!!!!!!! and cute!!!!!!!!!!!! i love you...
Happy birthday! have a great day i love you soooooooooooooooooooooo much!!!!!!!!!you are sooooooooooo hot!!!!!!!!!!!!!!!!!!!! and cute!!!!!!!!!!!! i love you...
Happy birthday! have a great day i love you soooooooooooooooooooooo much!!!!!!!!!you are sooooooooooo hot!!!!!!!!!!!!!!!!!!!! and cute!!!!!!!!!!!! i love you...
Happy birthday! have a great day i love you soooooooooooooooooooooo much!!!!!!!!!you are sooooooooooo hot!!!!!!!!!!!!!!!!!!!! and cute!!!!!!!!!!!! i love you...
Happy birthday! have a great day i love you soooooooooooooooooooooo much!!!!!!!!!you are sooooooooooo hot!!!!!!!!!!!!!!!!!!!! and cute!!!!!!!!!!!! i love you...
i love u so much
happy birthday zac
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____xxxxxxx zac efron...
BIG BOY