GOTLAND, SWEDEN - JUNE 03: Princess Madeleine of Sweden, Princess Leonore of Sweden and Christopher O'Neill are seen visiting Gotland Museum on June 3, 2016 in Gotland, Sweden. Duchess Leonore meets her horse Haidi of Gotland for the first time (Photo by Luca Teuchmann/Getty Images)

GOTLAND, SWEDEN - JUNE 03:  Princess Madeleine of Sweden, Princess Leonore of Sweden and Christopher O'Neill are seen visiting Gotland Museum on June 3, 2016 in Gotland, Sweden. Duchess Leonore meets her horse Haidi of Gotland for the first time  (Photo by Luca Teuchmann/Getty Images)