Watch : Inside Prince William and Kate Middleton's Family-Filled Summer With Their KidsPrince William and Kate Middleton had a royally fabulous summer. The Prince and Princess of Wales celebrated the sunny season with a plethora of activities alongside their kids Prince George, 13, Princess Charlotte, 11, and Prince Louis, 8. “The Summer Rewind,” the royals posted to their Instagram July 28. “Thank you to everyone who has made the last few months so special!” Alongside the messages, William and Kate, both 44, shared several sweet summer snaps, including a visit to Wimbledon with George and Charlotte and portraits of the three young royals throughout the summer months.