I've discovered a trick so good that I just have to share it. The best ever way to get someone to give a really genuine smile for the camera is to utter this magical two word phrase...."Dick Cheney."
I bet just reading that made you smile! I don't know why it works; but it works every single time for every single person. I used this like a charm at a very stuffy portrait session for work. And I think it will come in handy at the wedding, too.