I'm going to prom with one of my friends. We haven't said it but we both assume that we are going as just friends. So when I first see her and want to tell her that she looks nice. Fill in the blank: "You look (blank)"
should I go with: beautiful, nice, good, hot, sexy, (something that will make her laugh but still lets her know that looks good), other
If you want to make her laugh then you could whistle at her. I'd that would be hilarious! But then be like "no, really, you look amazing (or beautiful)" Something sincere after being silly. Whatever pops into your head first because that's obviously what you mean.