02/28/2011 at 01:00 AM EST
On April 29, when Prince William
and Kate Middleton
stand at the altar of Westminster Abbey, they'll have their best friends beside them-Prince Harry
, 26, as best man, and Pippa Middleton, 27, as maid of honor. As for the rest of the wedding party, think titled lunchbox crowd. Bridesmaids include Lady Louise Windsor, 7, daughter of William's Uncle Edward, the Hon. Margarita Armstrong-Jones, 8, and 3-year-olds Grace van Cutsem (daughter of Will's pal Hugh) and Eliza Lopes (Camilla's granddaughter). Charles and Diana had young people in their 1981 nuptials, but unlike Will and Kate, they didn't tap preschoolers for the honor. "It could be a bit chaotic," says a family friend, "but it will be lovely."