Monday, September 15th, marks quite a milestone: our beloved Prince Harry turns 30! Yes, the former wild-child royal is all grown up and he's become quite a man. From his military career to his endless volunteer work, we have a hunch his late mother Princess Diana would be more than proud. So, in honor of his big day, let's take a look at eight of his fellow royals — princesses from Monaco to Disney — in wow-mazing gowns, accompanied with fun facts about Harry himself. HBD, dude!