When it comes to animated features, it's easy to forget that real, live people have to supply the voices of the characters. Recently, though, that's been changing. When it came to Enchanted, we saw the vocal talents of Amy Adams and James Marsden transition from animation to real life right before our eyes. And, of course, once Frozen came along and obliterated pretty much all its predecessors, it was hard to separate Anna and Elsa from Kristen Bell and Idina Menzel. In light of these developments — and Walt Disney's birthday on Saturday! — we're going back to older Disney films and revealing the celebrity voices you might have totally forgotten about. Keep scrolling to see the surprising combinations.