Britain's Prince William and his wife Catherine, the Duchess of Cambridge, laugh as their son Prince George shakes the hand of Lynne Cosgrove, wife of the Governor-General of Australia Peter Cosgrove, after arriving in Sydney, April 16, 2014. Britain's Prince William, his wife Kate and their son Prince George flew from New Zealand to Australia, where they will now spend nine-days touring the country. REUTERS/Phil Noble (AUSTRALIA - Tags: ROYALS ENTERTAINMENT POLITICS)