This seems like a great moment for Harry Nilsson's Jump Into The Fire. It's a high-energy song that people would get into and the repetition of "We can make each other happy" makes for a pretty decent theme. The only drawback being the part where he sings "but you'll never be free".
Otherwise, give James Brown's Get Up Offa That Thing some consideration. You would really need to be capable of some funky dance moves to pull it off, though.
For a slower song, Louis Armstrong does a great version of "Makin' Whoopee".
If none of these strike your fancy, go for the James Bond theme music.
Big Balls-AC/DC Rise-American Music Club Good Vibrations-Beach Boys Shake Your Rump-The Beastie Boys Cat Walk-The Beat Happening (if you're cool!) Baby's On Fire-Brian Eno Whip It-Devo Double Barrel Prayer-Diamanda Galas (if you're crazy) Milord-Edith Piaf (Good one) Sex Bomb-Flipper
Tons more. Maybe it'd help if you told the bride's first name since the song selection could be personalized. But I think Milord by Edith Piaf is the best on my list. It's not funny, really, but it works.
How about "Searchin" by Chicago...."I've been searchin, hell yea, for an answer" "good things in life, last a long time". I don't know but this just seems to work.