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LONDON, UNITED KINGDOM - DECEMBER 06: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) A pregnant Catherine, Duchess of Cambridge accompanied by her husband Prince William, Duke of Cambridge leaves the King Edward VII hospital where she was being treated for acute morning sickness (Hyperemesis Gravidarum) on December 06, 2012 in London, England. (Photo by Indigo/Getty Images)

LONDON, UNITED KINGDOM - DECEMBER 06: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) A pregnant Catherine, Duchess of Cambridge accompanied by her husband Prince William, Duke of Cambridge leaves the King Edward VII hospital where she was being treated for acute morning sickness (Hyperemesis Gravidarum) on December 06, 2012 in London, England.  (Photo by Indigo/Getty Images)