ross. but the royal wedding is very different. >>> well, not all weddings countdowns but the royal wedding is very different, of course. it's exactly one month until prince harrynd meghan markle tie the knot. >> we have been following the happenings like a lot of you have and keir simmons is a link to british history. ♪ >> reporter: britain's getting ready to welcome prince harry's american bride boo the royal family. this week, meghan markle representing the queen with prince harry as ambassadors. >> i'm incredibly grateful that the woman i'm about to marry will be joining me in this work. >> reporter: in just four week's time, here at windsor castle, st. george's chapel, they'll exchange vows in front of 600 guests. the ceremony we now know will be very different from kate and william's wedding. smaller, more intimate and no politicians. william is expected to return the favor and be harry's best men. kate with baby number three due any day now will be there. >> understand that george and charlotte will be a page boy and bride's maid and in that sense we expect kate to be front and center to have to marshal her own children. >> reporter: after the service, t