Ashley Tisdale and boyfriend Jared Murillo attended Zac Efron’s 21st birthday. Starting off at Pace nightclub, fellow partygoers included Zac’s co-star girlfriend, Vanessa Hudgens, along with pals Monique Coleman, Brittany Snow, Amanda Bynes, Aly and AJ Michalka and Michelle Trachtenberg. Guests were spotted upon arrival, dropping off bottles of hard liquor as gifts to their now-legal friend. After Pace, Vanessa and Zac then headed over to Chateau Marmont with Aly and AJ. Oddly enough, the only person showing up at Chateau that was 21 was Zac, as Aly is 19, AJ 17, and Vanessa 19. Pictures to follow.