AUCKLAND, NEW ZEALAND - APRIL 11:  Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge joke together after sailing during their visit to Auckland Harbour on April 11, 2014 in Auckland, New Zealand. The Duke and Duchess of Cambridge are on a three-week tour of Australia and New Zealand, the first official trip overseas with their son, Prince George of Cambridge.  (Photo by Pool/Samir Hussein/WireImage)