Photos: Princess Kate turns 31
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Credit: Getty Images
LONDON, ENGLAND - NOVEMBER 27: Catherine, Duchess of Cambridge views a plate from Audubon's Birds of America alongside Director of the Natural History Museum Doctor Michael Dixon (L) and Special Collections Manager Judith Magee (R) as she attends the official opening of The Natural History Museums's Treasures Gallery at Natural History Museum on November 27, 2012 in London, England. (Photo by Dominic Lipinski - WPA Pool/Getty Images)
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