Hold on to your Zac Efron dolls because a trailer for Disney's HSM 3 has just been released - and it's tween-tastic! Your favorite Wildcats have finally reached their senior year of high school, and that can only mean one thing - more singing and choreographed dancing with 10 new original songs, of course! Check out the sneak peek featuring Vanessa Hudgens and Zac Efron (who's clearly been hitting the gym since the first HSM). - Gina DiNunno