Royals Visit New York

Britain's Prince William, Duke of Cambridge, and his wife, Catherine, Duchess of Cambridge arrive at the Metropolitan Museum of Art to attend the St. Andrews 600th Anniversary Dinner in New York, Dec. 9, 2014.

Catherine, Duchess of Cambridge waves to onlookers as she walks with her husband Prince William, Duke of Cambridge near the South pool of the National September 11 Memorial & Museum at the World Trade Center site in New York, Dec. 9, 2014.

Prince William, Duke of Cambridge (right) and Catherine, Duchess of Cambridge (right center) with Dikembe Mutombo (left center) during the game between the Brooklyn Nets and the Cleveland Cavaliers at Barclays Center, Brooklyn, New York. (Credit: Robert Deutsch/USA TODAY Sports)

Britain's Prince William, second from right, talks with rapper and entrepreneur Jay-Z, far right, as Kate, left, the Duchess of Cambridge, chats with Jay Z's wife, entertainer Beyonce, foreground center, in New York, Dec. 8, 2014.

Britain's Prince William, Duke of Cambridge, and his wife Catherine, Duchess of Cambridge, arrive at the Carlyle hotel in New York, Dec. 7, 2014.