W Magazine presents the best-dressed royal kids from around the world: Princess Leonor and Princess Infanta Sofia of Spain. Prince Christian and Princess Isabella of Denmark. Prince Ilisahito of Japan. Sweden's Princess Estelle and Prince Oscar. Twins Prince Jacques and Princess Gabriella of Monaco. Princess Alexia, Princess Catharina-Amalia, and Princess Ariane of the Netherlands. Crown Prince Moulay El Hassan of Morocco. Princess Elisabeth of Belgium. Princess Amalia of Luxembourg and more!