  Well technically animals can't marry. Also, even if a princess does marry a king, she's still a princess, at least by Britain's monarchial standards. And there's plenty of perfectly human ones so Nala isn't even necessary. Black Cauldron girl was...dammit.
No, not "dammit". The guy's name was Taran. Um...the girl's was Eilonwy. I have all of the Prydain Chronicles to back me up on that one, s'don'go thur. It's sad about that movie...I read that it was a disasterpiece in the box office even tho there was some animation innovation with that movie that made it ultra-mega-spiff-lookin'. And let's not forget....Ariel! That's nine. Jasmine, how about?!? Since Belle really isn't a princess, she gets lumped in with then tho.
I guess you could say she's one since Beast is a prince-thing if I recall, and that would make her a princess, marrying as such. So that's like a billion. Woohoo! And no hate crimes against the queer that mopped up the rest of the Disney princesses, now. 
