I dunno but any girl would be very flattered to know that someone thinks they are the prettiest girl they have ever seen.

I had someone walk up to me in a grocery store and Say That to me, "I'm sorry to impose, but I have just never seen anyone so beautiful! I just Had to speak to you!" I was startled and embarrassed, but he quickly put a card in my hand and thanked me for speaking to him.
It was sweet that he left it up to me, if there would be contact, but let me tell you, I never forgot him and it made my day/week/month.
Nothing like adoration to turn a girls head ...