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Britain's Prince William, Duke of Cambridge and his wife Kate, the Duchess of Cambridge, and their children Prince George and Princess Charlotte walk on the tarmac of the Airbus compound prior boarding their plane in Hamburg, northern Germany, on July 21,2017.
 The British royal couple are on the last stage of their three-day visit to Germany. / AFP PHOTO / POOL / Christian Charisius        (Photo credit should read CHRISTIAN CHARISIUS/AFP/Getty Images)
Britain's Prince William, Duke of Cambridge and his wife Kate, the Duchess of Cambridge, and their children Prince George and Princess Charlotte walk on the tarmac of the Airbus compound prior boarding their plane in Hamburg, northern Germany, on July 21,2017.
 The British royal couple are on the last stage of their three-day visit to Germany. / AFP PHOTO / POOL / Christian Charisius        (Photo credit should read CHRISTIAN CHARISIUS/AFP/Getty Images)

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Duchess of Cambridge expecting third child

Britain's Duchess of Cambridge and her husband, Prince William, have announced they are expecting a third child. CNN's Max Foster has more.

Duchess of Cambridge expecting third child

Britain's Duchess of Cambridge and her husband, Prince William, have announced they are expecting a third child. CNN's Max Foster has more.