When you watch your favorite television shows over the years, you don't really notice how much all of the actors change over time. But they actually do transform since you know, each season they're getting older! Today just so happens to be Ross Lynch's 21st birthday and he's certainly grown up from his early days playing Austin Moon on Austin & Ally. Each season in fact, he looks different and from season one to season four, he's a whole new person. Oh time, it has a way of doing things to you, doesn't it?
Click through the gallery to see all of the actors and their characters' transformations and then drop a comment below telling us who you think changed the most!