NUKU'ALOFA, TONGA - JULY 4:  Crown Prince Naruhito and Crown Princess Masako of Japan attend the official coronation ceremony for King Tupou VI of Tonga and Queen Nanasipau'u at the Free Wesleyan Church on July 4, 2015 in Nuku'alofa, Tonga. Tupou VI succeeds his brother, King Tupou V, who passed away in 2012. (Photo by Edwina Pickles/Fairfax Media/Getty Images)