Who is the 7th princess?

I'm reading Kingdom Hearts, and I got to the part where Maleficent says "The seven princesses are the key to opening the final door." I already grew out of princesses a long time ago, and I could only think of 6 princesses: Cinderella, Belle (Beauty and the Beast), Aurora (Sleeping Beauty), Jasmine (Aladdin), Snow White, and Ariel (The Little Mermaid). I can't think of a 7th princess... Please help me!!!!