The "minder" will accompany the 32-year-old Duchess of Cambridge on shopping trips and stand guard outside changing rooms while she tries on clothes, the Daily Star reported.
The Duchess was horrified this week when a German newspaper printed a sneaky picture of her.
The photographer had clicked his shutter just as the future queen's dress billowed up in a gust of wind on a visit to Sydney's Blue mountains during her official tour of Australia last month.
British newspapers refused to print the photo, saying it was in bad taste and an invasion of Kate's privacy.
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However, the editor of Bild splashed it in the German tabloid.
The Palace officials are now worried that Kate might fall prey to more sneaky shots taken by unscrupulous professional photographers or by opportunistic members of the public using their mobile phone cameras, the daily said.
Until recently, Kate would happily sneak off to High Street stores to look for clothes, leaving her bodyguard standing outside while she browsed.
Kate and husband Prince William have faced frequent battles to protect their privacy and modesty by preventing the publication of photographs.
The most notable case that created a furore in Britain was when topless pictures of Kate appeared in a French magazine in September 2012 taken on their holiday to a Provence Chateaux.
The couple launched legal proceedings and issued a statement saying: "They have been hugely saddened to learn that a French publication and a photographer have invaded their privacy in such a grotesque and unjustifiable manner."