The date hasn't been announced, but British brides-to-be who already have their dates are concerned William and Kate may pick theirs, says Majesty magazine Editor Ingrid Seward.
"They're worried," Seward explained from London to "Early Show on Saturday Morning" co-anchor Chris Wragge, " … that it's going to scuttle their wedding plans, and they're not going to be the princess on that day, it's going to be Kate, and that all their wedding guests will want to watch the royal wedding and not be concentrating on the wedding they're at.
"So, there are some very unhappy brides-to-be around here!
William and Kate to Wed at Westminster Abbey?
"A son of a friend of mine is getting married on May 7, and he actually knows Prince William, and they have a kind of similar guest list - I guess they have a kind of similar guest list. So, his bride-to-be is very unhappy and just wants this announcement (of the royal wedding date) to happen as soon as possible.
"But they've made their date - May 7 - so, there's not much they can do about it."
Another problem, Seward says, is "if you happen to be getting married on the same day as them, the logistics of possibly getting your guests into the center of London would be a nightmare.
"Then you've got to think about, maybe they like the Queen's caterers, maybe they won't have time to make your cake, and only have time to make William and Kate's cake!
"But I think the main worry is that your guests aren't going to be concentrating on you."
What advice would she give to British brides-in-waiting?
"Just go ahead, make your date, and don't worry about it. You can always record the (royal) wedding and show it to your guests later!"
And, joked Wragge, "Just make sure there's no television at the bar!"