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LONDON, ENGLAND - JANUARY 16: Catherine, Duchess of Cambridge attends an event hosted by The Fostering Network to celebrate the work of foster carers in providing support to vulnerable young people on January 16, 2015 in London, England. (Photo by Chris Jackson/Getty Images)

LONDON, ENGLAND - JANUARY 16:  Catherine, Duchess of Cambridge attends an event hosted by The Fostering Network to celebrate the work of foster carers in providing support to vulnerable young people on January 16, 2015 in London, England.  (Photo by Chris Jackson/Getty Images)