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(left to right) Princess Beatrice, the Duchess of York and Princess Eugenie meet young cancer patients and their families at the Teenage Cancer Trust's young persons unit at University College Hospital, London. (Photo by Ian West/PA Images via Getty Images)

(left to right) Princess Beatrice, the Duchess of York and Princess Eugenie meet young cancer patients and their families at the Teenage Cancer Trust's young persons unit at University College Hospital, London. (Photo by Ian West/PA Images via Getty Images)

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Princess Beatrice (left) and the Duchess of York meet Harry Sadler,17 from Colchester, during a visit to the Teenage Cancer Trust's young persons unit at University College Hospital, London. (Photo by Ian West/PA Images via Getty Images)

Princess Beatrice (left) and the Duchess of York meet Harry Sadler,17 from Colchester, during a visit to the Teenage Cancer Trust's young persons unit at University College Hospital, London. (Photo by Ian West/PA Images via Getty Images)

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Princess Eugenie meets Elias Taylor, 20 from London, during a visit to the Teenage Cancer Trust's young persons unit at University College Hospital, London. (Photo by Ian West/PA Images via Getty Images)

Princess Eugenie meets Elias Taylor, 20 from London, during a visit to the Teenage Cancer Trust's young persons unit at University College Hospital, London. (Photo by Ian West/PA Images via Getty Images)

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Princess Beatrice, the Duchess of York and Princess Eugenie meet young cancer patients and their families at the Teenage Cancer Trust's young persons unit at University College Hospital, London. (Photo by Ian West/PA Images via Getty Images)

Princess Beatrice, the Duchess of York and Princess Eugenie meet young cancer patients and their families at the Teenage Cancer Trust's young persons unit at University College Hospital, London. (Photo by Ian West/PA Images via Getty Images)

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(left to right) the Duchess of York, Princess Beatrice, and Princess Eugenie meet young cancer patients and their families at the Teenage Cancer Trust's young persons unit at University College Hospital, London. (Photo by Ian West/PA Images via Getty Images)

(left to right) the Duchess of York, Princess Beatrice, and Princess Eugenie meet young cancer patients and their families at the Teenage Cancer Trust's young persons unit at University College Hospital, London. (Photo by Ian West/PA Images via Getty Images)