Ashley Tisdale, Vanessa Hudgens and Zac Efron went to Sydney for their “High School Musical 3: Senior Year” Premiere. Tisdale wore a demure, pretty lace dress with a satin inner lining. Hudgens has stepped out into the brave new world with a plunging neckline and gaping hole begging for a wardrobe malfunction. Hudgens positively beamed in the limelight. These days, she favoured the maxi dress in the apparent bid to look more grown up and glamorous. Efron looked mighty pleased with two ladies hanging on his arms.