St. James' Palace also announced bridesmaids and page boys for the gala festivities.
The bridesmaids include Lady Louise Windsor, 7, the daughter of The Earl and Countess of Wessex; Margarita Armstrong-Jones, 8, the daughter of Viscount and Viscountess Linley; Eliza Lopes, the 3-year-old granddaughter of Prince Charles' wife Camilla, The Duchess of Cornwall; and Grace van Cutsem, 3, a godchild of William's.
Page boys for the wedding will be William Lowther-Pinkerton, 10, the son of William's private secretary, and Tom Pettifer, 8, another one of William's godchildren.
Details about the bridesmaids' dresses and the page boys' uniforms will be made available on the wedding day.
“Most of the bridesmaids and pages are very much from William's side, although that's not surprising,” said Vickers. “It was very much the same at Charles and Diana's wedding. It's just adorable having 3-year-olds involved. They'll look quite cute scampering around.”
The very idea of having 3-year-olds in a wedding that will be broadcast live to millions around the world may seem daunting, but Little said he expected someone would make sure the youngest bridesmaids don't act up or steal the show.
“Four bridesmaids and two pages seems like a very nice setup,” Little said. “And they have a nice range of ages from 3 to 10. Perhaps 3 is a little too young, but I'm sure the bridesmaids will be kept in line and not allowed to run amok.”