How To Get A Princess To Behave

I was chatting with a fellow Dad at my daughter’s preschool about his son’s crazy obsession with Batman. The costume(s), the jumping off sofa and maybe occasional building; the permanent bat cave installation under the dining table, and the special Batman diet of only potato chips and hot dogs.
I told him he had it easy, my daughter is obsessed with Princesses. Which is just like Batman if he wore pink and sang to animals.

I’m not sure exactly when this all happened; maybe sometime around her 2nd birthday when somebody showed her the Cinderella movie for about 5 minutes. That’s when it became her crack.
At times it can be annoying:

“No, mice aren’t going to pick up that mess you’ve made”
“No, that magic wand isn’t going to make that kid playing with your toys disappear”

At times it can be used for my advantage:

“If you don’t behave (holding cell phone to ear) I’m calling Cinderella and she’s going to ask for her stuff back!”

So far, my 3 years of parenting has taught me the "Princess" method sometimes works much better than "time-out" method.
Recently we had the opportunity to see Julie Andrews and a certain Mom asked her if she had any advice for a little Princess.
She did and this is what she said (in her really cool accent):

Princess Rules
A Princess always uses “Please” and “Thank You”
A Princess always thinks of others before herself
A Princess never slouches

Although good, I don’t think there are nearly enough especially for a 3-year old. So I’ve added a few to the list:

Princess Rules (v.2 additions)
A Princesses ALWAYS go poop on the potty.
A Princess NEVER whines.
A Princess NEVER asks, “What are we going to eat?” after leaving a restaurant.
A Princess NEVER watches the Doodlebops, Dora, Yo Gabba Badda, or the new Beverly Hills “90210”