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It's party time for Zac Efron!
The star of High School Musical 3: Senior Year celebrated his 21st birthday Saturday with an intimate two-hour dinner party at L.A.'s Pace restaurant with a group of friends and family that included his parents and brother, girlfriend Vanessa Hudgens, HSM3 co-stars Monique Coleman and Ashley Tisdale, her boyfriend Jared Murillo and pals Michelle Trachtenberg, Amanda Bynes, Brittany Snow and singing sisters Aly and AJ Michalka.
Efron kept it causal in a T-shirt and jacket while Hudgens, 19, who "helped plan the party," a source says, donned a colourful mini-dress. Guests arrived with wrapped gifts, including bottles of liquor for the actor, who can now legally drink alcohol.
Efron and Hudgens left the rustic Italian eatery hand-in-hand just before midnight and disappeared into a waiting car. But the celebration continued at a nearby hotel, where the birthday boy hosted an after-party with some of his dinner guests.
At the HSM3 premiere in L.A., Efron's friends and co-stars were mum on the night's festivities. But Efron pal Bubba Lewis told PEOPLE,
"We'll probably go out, eat some food, laugh, have a good time."
Co-star KayCee Stroh echoed Efron's desire for a low-key celebration.
"We're definitely going to party it up," she said. "But he's that guy that would rather sit down with friends and have a good discussion than deal with the craziness."
And what to get the guy who has everything? "I'm going to get him tinted windows," says Stroh. "That's what I gave Miley Cyrus for her birthday and he's getting them too."