Sarah Ferguson's eldest daughter, 36, was seen meeting staff and residents at the hospice before planting a tree wearing a lovely midi dress.
The royal opted for the 'Enya' midi dress from Erdem - a new addition to her wardrobe. The floaty number featured a puffball-style skirt with long sleeves and a tailored waistline.
The navy and white floral number was teamed with the most classic of flats - the 'Ballet Flats in Black Calfskin Grosgrain' from Chanel.
The highlight of Beatrice's pristine look was her beautiful tumbling curls which were styled with a side part.
Her sister, 34, opted for an understated updo to go with her Zimmermann 'Grape Polka Dots Maxi Dress' and Dune 'Hopeful' flats.
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"This hospice is a beacon of love and support for so many families," Princess Beatrice said in an address at the event. "The compassion and care provided here is truly inspiring, and it is a privilege to be part of this special day."
Princess Beatrice's summer uniform
A floaty floral dress and classic pumps have become the royal's go-to ensemble this summer.
In July, Edoardo Mapelli Mozzi's wife headed to St Mary's and St John's Primary School in North West London in her role as the patron of the British Skin Foundation to meet year five pupils who have created sun safety posters to highlight the importance of protecting your skin from potential skin cancers in later life.
She wore a printed midi dress from ME + EM with Chanel pumps.
A day at Wimbledon also called for a floral number. Prince William's cousin was spotted alongside her property developer husband as she sat in front of actor and author Stephen Fry and comedian Michael McIntyre in the royal box.
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