Prince George and Princess Charlotte stole the show at a sailing regatta Thursday in which their parents, Prince William and Kate, competed.
Charlotte, 4, who has made a name for herself with her waves and expressions at royal events, caught the crowd's eye again by sticking out her tongue before the presentation ceremony at the Kings Cup regatta.
Out on the water, she and her older brother George, 6, watched the race on board a boat for onlookers that included their grandfather, Michael Middleton.
George, the oldest of Kate and William's three children, was spotted wearing a captain hat along with his nautical blue and white striped polo shirt.
William and Kate were skippers of two of the eight boats in The Kings Cup, held in Cowes on the Isle of Wight.
Prince William's boat took home third place, while the boat skippered by TV hos and adventurist Bear Grylls won the race.
Kate took it in stride when she accepted the competition's wooden spoon on behalf of her team for coming in last place.
The competition was for a good cause, benefiting charities for which William and Kate are patrons. Each of the eight boats in the race represented a charity the royal couple supports.
William competed on behalf of Child Bereavement UK, a charity that helps children and families rebuild their lives after the death of a loved one. Kate competed on behalf of Early Years, a program Kate started with The Royal Foundation to help give young children their best start in life.
The regatta was scheduled to take place on Friday but was moved up a day because of a weather warning in the area.
(MORE: Duchess Kate reveals Prince George received lesson from favorite tennis player Roger Federer)The winning team in the inaugural regatta was awarded The King's Cup, a historic trophy first presented by King George V at Cowes' Royal Yacht Squadron in 1920, according to The Royal Foundation.
"Their Royal Highnesses hope that The King's Cup will become an annual event, bringing greater awareness to the wider benefits of sport, whist also raising support and funds for the causes that The Duke and Duchess support," the foundation said in a statement.
(MORE: Duchesses Kate and Meghan take kids to watch Princes William and Harry play polo)William and Kate are both athletic and have shown their competitive sides in public before.
William won bragging rights two years ago in Heidelberg, Germany, when his crew boat defeated Kate's boat in a race on the Neckar river.
A few years before though, in 2014, Kate defeated William twice while captaining an America's Cup yacht in Waitemata Harbour off the coast of Auckland, New Zealand, where the royals were on a 19-day tour.