Zac Efron’s 21st Birthday Surprise - NBC4 Washington

Zac Efron’s 21st Birthday Surprise

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    Efron's HSM buddies conspire to throw him a surprise birthday party.

    “High School Musical” star Zac Efron turns 21 today – but girlfriend Vanessa Hudgens told Access Hollywood’s Billy Bush there’ll be no wild night on the town for the young actor.

    “We are laid-back people,” Vanessa told Billy at the “High School Musical 3” premiere in LA earlier this week.

    [ VIEW THE PHOTOS: ‘High School Musical 3’ Hollywood Premiere ]

    But, she said, they’ll be celebrating – and Zac doesn’t even know about it yet.

    “It’s a surprise,” she said, laughing. “That’s the most you are gonna get out of me.”

    [ VIEW THE PHOTOS: Zac Efron ]

    One thing’s for sure — “HSM” co-star Ashley Tisdale seems to be a collaborator on the festivities.

    “He doesn’t even know,” Ashley told Access. “It’s a complete surprise.”

    “I can’t say anything,” she added. “Vanessa would be so mad.”

    Related Content from AccessHollywood.com:
    VIEW THE PHOTOS: ‘High School Musical’ Stars
    PLAY IT NOW: ‘High School Musical 3’ Premiere: Zac & Vanessa
    PLAY IT NOW: ‘High School Musical 3’ Cast Tells All - Part I

    MORE ACCESS ON THESE TOPICS: Zac Efron - High School Musical - Young Hollywood - Ashley Tisdale - Vanessa Hudgens