To have seen all seven -- and coming soon, eight! -- "Harry Potter" films over the past decade is to have gone on a magical journey on screen, and watched, perhaps even more magically, the stunning growth and maturation of the film's highly successful stars.Daniel Radcliffe, Emma Watson and Rupert Grint -- not to mention Robert Pattinson, he of just a single "Potter" film -- have all avoided the pitfalls of teen stardom while growing into mature top liners in their own right.