come on over to the dark side. come on, rob. everybody is getting into it, even the guys. yeah. it s safe to come over. all right, come friday morning, a million people are expected to crowd into a very small part of london and all of those folks, of course, will want a glimpse of the royal newlyweds. that s right, when prince william marries catherine middleton there will be plenty of comparisons to the marriage of william s parents. our special royal correspondent katie nicole compares the brides. reporter: 30 years and three months separate the wedding days of lady diana spencer and catherine elizabeth middleton. i would have loved to have met her. she s obviously she s an inspirational woman to look up to. reporter: the tale of these two brides from the day they met their princess to the day of their i dos unfolds in some astoundingly similar and remarkably different ways. a kindergarten teacher, diana was barely 19 when prince charles did a double take.