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Catherine, the Duchess of Cambridge, signs the visitors book after touring the National Portrait Gallery in Canberra on April 24, 2014. Prince William, his wife Kate and their son Prince George are on a three-week tour of New Zealand and Australia. Britain's Prince William, his wife Kate and their son Prince George are on a three-week tour of New Zealand and Australia. AFP PHOTO / POOL (Photo credit should read LUKAS COCH/AFP/Getty Images)

Catherine, the Duchess of Cambridge, signs the visitors book after touring the National Portrait Gallery in Canberra on April 24, 2014. Prince William, his wife Kate and their son Prince George are on a three-week tour of New Zealand and Australia. Britain's Prince William, his wife Kate and their son Prince George are on a three-week tour of New Zealand and Australia.    AFP PHOTO / POOL        (Photo credit should read LUKAS COCH/AFP/Getty Images)