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Prince George and Princess Charlotte cheer on Kate and William at King's Cup regatta

COWES, ENGLAND - AUGUST 08:  Prince George watches the inaugural King’s Cup regatta hosted by the Duke and Duchess of Cambridge on August 08, 2019 in Cowes, England. Their Royal Highnesses hope that The King’s Cup will become an annual event bringing greater awareness to the wider benefits of sport, whilst also raising support and funds for Action on Addiction, Place2Be, the Anna Freud National Centre for Children and Families, The Royal Foundation, Child Bereavement UK, Centrepoint, London’s Air Ambulance Charity and Tusk. (Photo by Chris Jackson/Getty Images)
Prince George and Princess Charlotte (top right) watch the King's Cup regatta on the Isle of Wight. [Photo: Getty]

Prince George and Princess Charlotte cheered on their parents, the Duke and Duchess of Cambridge at the King’s Cup regatta on the Isle of Wight on Thursday afternoon.

The royal siblings were spotted on another yacht with their grandparents Michael, 70, and Carole Middleton, 64.

Six-year-old George wore a captain’s hat and a life jacket over his H&M navy and white striped polo top (available only in the white colourway for £7.99) as he watched the eight boat race.

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COWES, ENGLAND - AUGUST 08:  Prince George watches the inaugural King’s Cup regatta hosted by the Duke and Duchess of Cambridge on August 08, 2019 in Cowes, England. Their Royal Highnesses hope that The King’s Cup will become an annual event bringing greater awareness to the wider benefits of sport, whilst also raising support and funds for Action on Addiction, Place2Be, the Anna Freud National Centre for Children and Families, The Royal Foundation, Child Bereavement UK, Centrepoint, London’s Air Ambulance Charity and Tusk. (Photo by Chris Jackson/Getty Images)
It looks like Prince George has lost more baby teeth. [Photo: Getty]

He flashed a gap toothed smile as Kate, 37, and William, 37, went head-to-head alongside celebrities to raise awareness and funds for eight of their patronages.

Princess Charlotte, four, could be seen sitting inside the boat, wearing a blue striped dress with a white Peter Pan collar.

Blogger WhatKatesKidsWore tweeted that Charlotte looks to be wearing a Ralph Lauren frock, which is currently £90.

According to reports, Kate and William’s youngest child Prince Louis, one, was also in Cowes on the day.

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COWES, ENGLAND - AUGUST 08: Princess Charlotte attends the King's Cup Regatta on August 08, 2019 in Cowes, England. (Photo by Karwai Tang/WireImage)
Princess Charlotte on board the boat. [Photo: Getty]
COWES, ENGLAND - AUGUST 08: Michael Middleton and Prince George watch the inaugural King’s Cup regatta hosted by the Duke and Duchess of Cambridge on August 08, 2019 in Cowes, England. Their Royal Highnesses hope that The King’s Cup will become an annual event bringing greater awareness to the wider benefits of sport, whilst also raising support and funds for Action on Addiction, Place2Be, the Anna Freud National Centre for Children and Families, The Royal Foundation, Child Bereavement UK, Centrepoint, London’s Air Ambulance Charity and Tusk. (Photo by Chris Jackson/Getty Images)
Prince George watches with his grandfather Michael Middleton. [Photo: Getty]

Earlier today, the Duchess of Cambridge was spotted wearing an £81 striped Sandro top with her LK Bennett sailor pants and Superga trainers.

She later changed into a sailing jacket, polo top, shorts and New Balance sneakers.

COWES, ENGLAND - AUGUST 08: Catherine, Duchess of Cambridge at the helm competing on behalf of The Royal Foundation in the inaugural King’s Cup regatta hosted by the Duke and Duchess of Cambridge on August 08, 2019 in Cowes, England. Their Royal Highnesses hope that The King’s Cup will become an annual event bringing greater awareness to the wider benefits of sport, whilst also raising support and funds for Action on Addiction, Place2Be, the Anna Freud National Centre for Children and Families, The Royal Foundation, Child Bereavement UK, Centrepoint, London’s Air Ambulance Charity and Tusk. (Photo by Chris Jackson/Getty Images)
Kate at the helm. [Photo: Getty]

Prince George celebrated his birthday last month before heading off on holiday with his parents and younger siblings. Photos of him wearing an England football shirt were released to mark the occasion.

The Cambridges spent two weeks in a £27,000 luxury villa on the private Caribbean island Mustique.

The children were last seen in public at the King Power Royal Charity Polo Day in July, where they watched dad William play alongside uncle Harry.

The Cambridge children met their baby cousin Archie for the first time at the event.

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