She also helped out with some cupcake decorating, Harry did some plate-spinning, and there were breakdancing workshops on the grounds before the day capped off with a parachute display by the Royal Air Force.

Kate Middleton Spent Saturday Launching Water Balloons at Buckingham Palace  for a Very Good Cause | Glamour
Kate Middleton Spent Saturday Launching Water Balloons at Buckingham Palace  for a Very Good Cause | Glamour
William, Kate et Harry, trois enfants terribles dans les jardins de  Buckingham