I would treat them like any other person, and be nervous around them...which is like any other person for me haha. I lived in a very small town where a very famous person lives in my late teens and early twenties. They were just a regular person who happened to be famous. Pretty cool person. I think the people in town were protective of the person and respecting their privacy. Everyone treated them just like a local and that helped me see them as a person too, which was cool (helping to break the rose colored celeb glasses for me which is a good thing).