Danish Crown princess Mary (centre L) and Crown Prince Frederik (centre R) greet Naoki Ogi (R) professor of pedagogy of Hosei University as they arrive at a traditional Japanese garden to meet young Japanese students and education workers in Tokyo on March 26, 2015. The Danish royal couple are on a three-day visit to promote Greenland. AFP PHOTO / Yoshikazu TSUNO        (Photo credit should read YOSHIKAZU TSUNO/AFP/Getty Images)