
Kate, the wife of Queen Elizabeth's grandson Prince William, was given honorary lifetime membership of the charity in recognition of her "talent and enthusiasm".
Her photographs, the first official portraits to be taken by a member of the royal family, have included shots of George holding his younger sister and of the young prince on his first day at nursery school.
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"The Duchess of Cambridge has had a long-standing interest in photography and its history," said Michael Pritchard, chief executive of the society which was formed in 1853 and counts Elizabeth's great-great-grandmother Queen Victoria and her husband Prince Albert among its early patrons.
"She is latest in a long line of royal photographers and the Society is pleased to recognise her talent and enthusiasm through honorary membership," Pritchard added.
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