Well, technically even though we saw a wedding, I don't think that could count. ^_^ It was more of just something on stage for their big broadway musical right? Which means that if it is a hit, they'll be getting married a lot, and with kermit having had amnesia, I'm sure they never had a chance to do preperations to make it legal. ^_^ SO no real marraige there.
As well as the fact I don't think kermit loves her, just feels he's expected to, since she is very ..urm.. loud about her feelings to him and how he'd be a fool to not love her. And besides the occassional celebrity, I've not seen anyone go after the frog. ^_^ If he ever does marry her for real, it might simply be out of loneliness or finally giving in to the chase.