Most people lucky enough to meet a royal would want a keepsake from their special encounter.
So many opt to get a special snap of the moment, with many members of the Firm now happily obliging to selfies.
But the Princess of Wales has revealed one thing she is not allowed to provide the public with as a souvenir - despite it being a relatively simple request.
She made the admission during her visit to the Chelsea Flower Show, where she toured the showgrounds with some curious school children.
At one point, Kate and the kids looked around the Royal Entomological Society's garden, where they tried to identify the bugs there and drew some sketches.
Keen to secure something to remember her by, some of the children asked the princess to sign her name on their drawings.
But according to The Telegraph, she told them: "My name's Catherine. I'm not allowed to write my signature, it's just one of those rules."
However, not wanting to leave the children empty-handed she drew some sketches for them - including one of a flower, another of a tree and one of a pond surrounded by some plants.
Elsewhere on the trip to the Flower Show, Kate sat down to enjoy picnic time with the children, where she was quizzed by the youngsters about royal life, to which Kate replied: "You have to work hard".
She also offered the youngsters a glimpse of Prince Louis' school life, saying he has been growing broad beans in the school garden.
Kate also met with ex-servicemen and women the Chelsea Pensioners. In one of the gardens, a covered dining area has been created for them alongside a kitchen that will produce meals for the elderly group from produce grown nearby.
"What's on the menu?" Kate asked as the pensioners tucked into chargrilled peas with herbs.
Harry Puttick, who served with the Royal Welsh Fusiliers for 30 years, replied gallantly: "The peas are forgettable, you are not."
With the cook nearby, he joked afterwards: "I'd better say the peas were wonderful, but it was fantastic to meet the future Queen."
She wore a vibrant bubblegum pink ME+EM dress that she previously wore in 2021 when meeting a five-year-old cancer survivor at the Palace of Holyroodhouse in Edinburgh.
Later, King Charles and Queen Camilla visited the Chelsea Flower Show as well the Duke and Duchess of Gloucester and Prince and Princess Michael of Kent.
The late Queen was also a fan of visiting the Chelsea Flower Show - and this year's is the first since her death.
