"Certainly, there will be an exchange of rings in the ceremony," said ET's resident royal family expert Katie Nicholl on Thursday. However, she said that it's unclear at this point what Harry's plans are after the wedding.
Nicholl -- author of Harry: Life, Loss, and Love, about the soon-to-be groom -- also shared some details about the royal precedence that could play a part in Harry's decision.
"Prince William has chosen not to [wear his ring]," Nicholl explained, "[But] we'll have to wait and see with Prince Harry."
While there is no specific royal protocol regarding whether or not male members of the monarchy should wear their wedding bands, it has been quietly established tradition to forgo them. Prince Philip has not worn one since marrying Queen Elizabeth in 1947, and Prince Charles has not worn one following either of his marriages.
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William's decision not to wear one is reportedly a matter of personal preference more so than adherence to any unspoken custom.
"[Harry] has proven himself to be a very modern man in so many ways that possibly he might decide to break Royal tradition and actually wear the ring for longer than just his wedding day," she added. "We shall see."
"The little prince is going to be at home, probably being cared for by his nanny and Carole Middleton," said Nicholl, referring to Kate Middleton's mother. "Kate will be at the wedding but not with her baby. I think he's a little too young for such a big day out."