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Catherine, the Duchess of Cambridge (L), carries her son Prince George as she walks down the stairs from the plane as they arrive at Defence Establishment Fairbairn in Canberra on April 20, 2014. Britain's William, his wife Kate and their son Prince George are on a three-week tour of New Zealand and Australia. AFP PHOTO / Mark GRAHAM (Photo credit should read MARK GRAHAM/AFP via Getty Images)

Catherine, the Duchess of Cambridge (L), carries her son Prince George as she walks down the stairs from the plane as they arrive at Defence Establishment Fairbairn in Canberra on April 20, 2014. Britain's William, his wife Kate and their son Prince George are on a three-week tour of New Zealand and Australia.   AFP PHOTO / Mark GRAHAM        (Photo credit should read MARK GRAHAM/AFP via Getty Images)