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Prince William, Duke of Cambridge, and his wife, Catherine, Duchess of Cambridge, who are expecting their second child, arrive at the Carlyle Hotel in Manhattan, December 7, 2014 (Credit: AP/Chad Rachman)

Prince William, Duke of Cambridge, and his wife, Catherine, Duchess of Cambridge, who are expecting their second child, arrive at the Carlyle Hotel in Manhattan, December 7, 2014 (Credit: AP/Chad Rachman)