Zac Efron’s 21st Birthday Party Night

Fresh off of the big Los Angeles premiere of “High School Musical 3: Senior Year,” Zac Efron and friends headed out in Hollywood to ring in his 21st birthday on Saturday night (October 18).

Starting off at Pace nightclub, fellow partygoers included Zac’s co-star girlfriend, Vanessa Hudgens, along with pals Monique Coleman, Ashley Tisdale, Jared Murillo, Brittany Snow, Amanda Bynes, Aly and AJ Michalka and Michelle Trachtenberg.

While most guests were spotted upon arrival, dropping off bottles of hard liquor as gifts to their now-legal friend, Efron and Hudgens stayed covered up, not wanting to be seen.

After Pace, Zanessa then headed over to Chateau Marmont with Aly and AJ. Funnily enough, the only person showing up at Chateau that was 21 was Zac, as Aly is 19, AJ 17, and Vanessa 19.