THIMPHU, BHUTAN - APRIL 15:  Catherine, Duchess of Cambridge and  Prince William, Duke of Cambridge after their trek to the Tiger's Nest Monastery during a visit to Bhutan on the 15th April 2016 in Thimphu, Bhutan. The Royal couple are visiting Bhutan as part of a week long visit to India and Bhutan that has taken in cities such as Mumbai, Delhi, Kaziranga, Bhutan and Agra. (Photo by Joe Giddens - Pool/Getty Images)