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TOKYO, JAPAN - DECEMBER 2: (EDITORIAL USE ONLY) In this photo released by the Imperial Household Agency, Crown Prince Naruhito (L), Crown Princess Masako (R) and their daughter Princess Aiko pose at their residence during a photo-shoot held on December 2, 2010 at the Togu Palace in Tokyo, Japan. Masako turns 47 on December 9, 2010. (Gamma/Imperial Household Agency) (Photo by KURITA KAKU/Gamma-Rapho via Getty Images)

TOKYO, JAPAN - DECEMBER 2: (EDITORIAL USE ONLY)  In this photo released by the Imperial Household Agency, Crown Prince Naruhito (L), Crown Princess Masako (R) and their daughter Princess Aiko pose at their residence during a photo-shoot held on December 2, 2010 at the Togu Palace in Tokyo, Japan. Masako turns 47 on December 9, 2010. (Gamma/Imperial Household Agency) (Photo by KURITA KAKU/Gamma-Rapho via Getty Images)