Kate told children at the Chelsea Flower Show earlier this year about the rule she has to follow.
It is well known that being in the royal family comes with various rules of what can and cannot be done in public.
Kate and the kids looked around the Royal Entomological Society's garden and some of the youngsters asked the princess to sign her name on their drawings. Later during the event, Kate and the children sat down to enjoy picnic time where she was quizzed by the youngsters about royal life, and she said: "You have to work hard".
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