Japanese Crown Princess Masako smiles as she waves [Getty Images]

TOKYO, JAPAN: Japanese Crown Princess Masako smiles as she waves to wellwishers from behind bulletproof glass on a balcony to celebrate the 66th birthday of Emperor Akihito at the Imperial Palace in Tokyo 23 December 1999. The crown princess, wife of Crown Prince Naruhito, underwent tests at an Imperial Household Agency hospital last week but her pregnancy was not confirmed. AFP PHOTO (Photo credit should read JIJI PRESS/AFP via Getty Images)

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