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(Original Caption) Prince Hiro and Princess Masako in a convertible. (Photo by Yamaguchi Haruyoshi/Sygma via Getty Images)

(Original Caption) Prince Hiro and Princess Masako in a convertible. (Photo by Yamaguchi Haruyoshi/Sygma via Getty Images)

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(Original Caption) Prince Hiro and Princess Masako in a convertible. (Photo by Yamaguchi Haruyoshi/Sygma via Getty Images)

(Original Caption) Prince Hiro and Princess Masako in a convertible. (Photo by Yamaguchi Haruyoshi/Sygma via Getty Images)

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TOKYO - JUNE 9: (FILE PHOTO) In this handout photo from the Imperial Household Agency, Crown Prince Naruhito of Japan and his wife Crown Princess Masako bow to Emperor Akihito and Empress Michiko during a ceremony to greet them at their wedding at the Imperial Palace June 9, 1993 in Tokyo. Crown Prince Naruhito and Crown Princess Masako will mark their 11th wedding anniversary on June 9, 2004. (Photo by Imperial Household Agency/Getty Images)

TOKYO - JUNE 9:  (FILE PHOTO) In this handout photo from the Imperial Household Agency, Crown Prince Naruhito of Japan and his wife Crown Princess Masako bow to Emperor Akihito and Empress Michiko during a ceremony to greet them at their wedding at the Imperial Palace June 9, 1993 in Tokyo. Crown Prince Naruhito and Crown Princess Masako will mark their 11th wedding anniversary on June 9, 2004. (Photo by Imperial Household Agency/Getty Images)