What is it about Bravo’s wildly successful Real Housewives franchise that is toxic to marriages?  Many couples on the show have started out as outwardly happy, couples and ended up divorced.  The most recent of these breakups is Vicki Gunvalson, of Real Housewives of Orange County fame, who just filed for divorce from her long-suffering husband Donn.  It came as quite a shock to viewers; though it was clear the two had troubles for some time, they renewed their vows last season.   It could be that the number of divorces is no higher than the average, and it just seems like quite a few since they are televised.  Or it could be that the show gives women newfound independence and fame, which could have an impact on their personal relationships.  In any case, let’s take a look at some of the marriages that have crumbled on Real Housewives.[ITPGallery]