The Duke and Duchess of Cambridge have written to two photographers, asking them to stop "harassing and following" Prince George and his nanny.
The complaint comes after an individual was seen last week "in the vicinity" of the young Royal, Buckingham Palace said, adding that there is reason to suspect George's daily routines may have been subject to "surveillance and monitoring" for some time.
The individual has previously been spoken to on a number of occassions by protection officers about his behaviour in respect to other members of the Royal family, according to Palace officials.
A spokesperson said: "The Duke and Duchess understand the particular public role that Prince George will one day inherit but while he is young, he must be permitted to lead as ordinary a life as possible.
"No parent would tolerate the suspicion of someone pursuing and harassing their child and carer whilst their child is playing in a public park or going about their daily activities."
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Prince George is a "lively, confident and very determined young boy", a photographer who has captured the key stages of his lives has said.
The Prince has been photographed by the Press Association's John Stillwell with his arms outstretched and walking confidently in an official picture released ahead of his first birthday on Tuesday.
"Prince George was very lively and very sure of himself and confident - a very determined young boy," Stillwell said.
"When you have children yourself you don't realise they grow up in such a short space of time, it's always other people saying how big they've grown.
"So having seen him soon after he was born and at his christening three months later, he's now gone from a baby at his christening to a toddler, that's the biggest change.
"And who does he look like? I'd have to say his dad, William."
The first official birthday photograph of Prince George has been released ahead of his first birthday on Tuesday.
With his arms outstretched and walking in his trademark dungarees, the future king looks every inch the confident toddler.
The adorable snap was taken when his proud parents visited the Sensational Butterflies outdoor exhibition at London's Natural History Museum.
The Duke and Duchess of Cambridge are expected to hold a birthday party for him at their Kensington Palace apartment with just close family and friends.
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