If not, then your idea of bringing a PSP when you go shopping with your girl is a NO, NO. It shows you are not interested in the things she does. No man, that is not the way to go.... You should go with her, assist her and give comments or favorable suggestions to her choices of shoes, bags, dresses, etc.
Then when you are MARRIED you can bring your PSP or go around the Mall yourself and wait for her call to fetch her and her shopping bag... not when you are just dating her.... bad move man... :)