High School Musical will always have a special place in our hearts: we still know all the choreography to the "We're All In This Together" dance, and can sing the entire soundtrack from memory.
In honor of Ashley Tisdale's 30th birthday today (!!!), we're dedicating our Throwback Thursday to looking back on how much the cast has grown up and changed over the years.
Click through the gallery to see then-and-now photos of the cast's style transformations. Then, in the comments section below, let us know who you think has changed the most!