Catherine, the Duchess of Cambridge (C), hands Prince George over to Britain's Prince William (2nd L), as they are met upon their arrival from New Zealand by Australia's Governor-General Peter Cosgrove (L) and others at Sydney airport on April 16, 2014. William, his wife Kate and their son Prince George are on a three-week tour of New Zealand and Australia.   AFP PHOTO / WILLIAM WEST        (Photo credit should read WILLIAM WEST/AFP/Getty Images)