Best way to ask to prom? Creative! Cute! dance?

[danimal44p]

So i want to ask my GF (3 months or so) to prom. We've already "agreed" to go together, but i want to do something cute to ask her. I have a couple ideas that i like. Shes kind of a girly girl. She really likes cute things and doesnt like being embarassed.
So a couple of my ideas...
1.Put a poster on her windshield while shes at work and tell her to drive to a restauraunt where ill be waiting inside, and i will pre arrange for the waiter to bring her a cake that has the question written on it when she comes in.
2.Put Post-Its all over her car and randomly place the letters asking her to go with me.
3.Write her a story about us (but use differnt names) and read it to her and have it end with going to prom.
She has a set work schedule for me to work around so that helps alot. also her best friend and dad would be very helpful with anything i would need them to do. ( Hes already given me the house for a night to make her dinner.)
Any other suggestions? vote for your favorite!