This is a great wedding song, I'm surprised I don't hear it more.
"I Do," by the J Geil's Band.
And of course, since when you think J. Geils, you think "Centerfold," here it is:
Funny story, I had once sang this on video when I was 18, for a girl I was dating. Yes, sang and danced to this on video. Never saw it again until 30 years later at my wedding. Embarrasing? Hell yes. But damn, I looked good.
-om