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Duke and Duchess of Cambridge

Associated Press
Britain's Kate, the Duchess of Cambridge, reacts as she is presented a badge that says "Baby on Board", normally available to pregnant passengers to encourage others to give them a seat, watched by Britain's Queen Elizabeth II, bottom, at Baker Street underground station in London, for a visit to mark the 150th anniversary of the London Underground, Wednesday, March 20, 2013.  The Queen made her first public engagement in more than a week Wednesday after cancellations following her hospitalization for a stomach bug.  The British head of state joined her husband Prince Philip and their granddaughter-in-law, Kate, for the event marking the 150th anniversary of London's sprawling subway system, affectionately known as the Tube.  (AP Photo/Matt Dunham)

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Britain's Prince William and wife Catherine Middleton welcomed a son, Prince George, on July 22, 2013. The infant will become third in line for the British throne after his grandfather Prince Charles and his father, William.

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