WELLINGTON, NEW ZEALAND - APRIL 10:  Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge unveil a portrait of Queen Elizabeth II by New Zealand artist Nick Cuthell during Day 4 of a Royal Tour to New Zealand at Government House on April 10, 2014 in Wellington, 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 Mark Mitchell - Pool/Getty Images)