If you're obsessed with the Harry Potter cast, can you even imagine how J.K. Rowling feels about them? For more than a decade, the group collaborated on the beloved Harry Potter movies, and the author shared sweet moments with the main actors at each of the films' premieres. As Daniel Radcliffe, Rupert Grint, and Emma Watson grew up before our eyes, the story unfolded and a new movie (and book!) came out every couple years. Since Friday marks J.K. Rowling and Harry Potter's birthdays, look back at some of the author's sweetest moments with everyone's favorite wizard trio, then check out Harry Potter cast reunions and see how J.K. Rowling mapped out the stories.