ABC's Disney Family Singalong pulled on all of our nostalgic heartstrings on Thursday (April 16), but a serious throwback came in the form of an epic High School Musical reunion, in which Ashley Tisdale, Vanessa Hudgens, Corbin Bleu, Lucas Grabeel, Monique Coleman and director Kenny Ortega came together (virtually) to perform "We're All in This Together."This isn't the first time the group came together since the final installment of the HSM franchises hit theaters in 2008.