Eight state-of-the-art racing yachts competed on the Solent, head to head, each representing a charity championed by William and Kate.
George, six, was pictured on a boat alongside younger sister Princess Charlotte and he proudly showed off his gap-toothed smile.
William and Kate competed against each other, and a host of celebrities, including comedian John Bishop, on a cloudy but relatively calm day around Cowes.
Last modified on Aug 08, 2019 14:20 BST Laura Sutcliffe Kate Middleton looked incredible at the King's Cup yachting regatta with husband Prince William, wearing a white polo t-shirt, shorts and trainers as she took part in a charity race.
The tiresome weather did not stop the couple sporting shorts for the two races but a royal win was not to be, with Grylls winning overall.
Each boat represented one of the charities being supported by the Duke and Duchess. Once they were out at sea, both royals looked very much into winning the competition.
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Kate and William are strong advocates for sports, and have undertaken work both in the United Kingdom and overseas to highlight the positive impact that athletics can have on young people.
In the second race, many boats - including the duchess's - were disqualified for not going back and starting the race at the line.
The Duchess will support four of her patronages: Action on Addiction, Place2Be, the Anna Freud National Centre for Children and Families, and The Royal Foundation in connection with Her Royal Highness's longstanding work on Early Years. They've spent the afternoon competing for the sought after King's Cup.
The first ever King's Cup saw the Royals - along with celebrities - enjoy the Solent in ideal conditions.
The event gave the couple the chance to renew their sporting rivalry. Prince William's boat came third while Kate's came in seventh.
William took the honours again during a visit to the German city of Heidelberg in 2017 when he was victorious in a riverboat race against his wife.