Looking for a manga that has something like this?

Well, Kirara Princess might be a good manga then. It's about an ordinary girl that loves all the Disney princesses. She wakes up a sleeping prince and magically gets the princesses' powers. She helps the prince to find the missing princess for his kingdom, but before she can, her best friend is kidnapped. So they go to find her and Kilala (the main character) meets all the Disney princesses along the way. Oh, and they have a magical tiara. The manga is pretty good (well, I think so). :)