I do wedding photography, and shoot like 20-30 weddings some summers... this is the conclusion I've come to as well. Women who have even slight tendencies at being overwhelmed, combined with a little bit of selfishness, ALWAYS blow up. Since I normally shoot the engagement session too before the wedding, I can almost pick which ones will be a "bridezilla" now. Then sure enough they start freaking out at their now husband shortly before the ceremony and continue getting worse throughout the day. It's always the "princess" types. Every. Single. Time.I might guess that another root cause for the Bridezilla phenomenon is that women are expecting a huge, lavish wedding and expecting to be the center of attention and expecting everything to go perfectly. However, events like this rarely go perfectly.