We did, and we got a YOAMD because of it! DD6 had dressed as Jasmine for the Princess Breakfast, and although we had a change of clothes and shoes for her, she insisted on wearing the costume afterward.
It was our first day at Disney, and we went straight from breakfast to Soarin'. There was a 50 minute wait, so we were deciding whether or not to FP it. A CM walked up to DD and said, "Good morning, Princess Jasmine." DD ate that right up, and said good morning to him. He asked her if she would like to ride Soarin' RIGHT NOW, and she said that she did!
He took us out back, and then back inside through a staff only door, where he thrilled our DDs by telling them that this was the way the celebrities got on all of the rides. He walked us right to the front of the line, and announced our presence. Everyone applauded. It was so awesome!!!
Funny thing was that DD wanted to wear that costume 24/7 after that - LOL!