Now, the sassy four-year-old has struck again while accompanying family at The King's Cup Regatta.
The event was due to take place tomorrow (Friday) but anticipated weather forced organisers to push things forward by 24 hours. William's team came in fifth during the second race, but Kate's team was disqualified for starting too early.
Unfortunately for the Duchess, she was awarded the wooden spoon for her yacht's poor performance, but it's safe to say she got the last laugh when her daughter made her thoughts on the matter known (we can only assume, of course) at the winner's ceremony.
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William's boat finished the race third while Kate came in seventh in the first race.
She and Prince William, 37, competed against each other and a host of other celebrities at the charity race, eventually losing to Bear Grylls.
See the best photos from the King's Cup regatta in our gallery.
Mr Kenny's crew represented the Tusk organisation which supports wildlife conversation in Africa.
A statement from Kensington Palace said: "The Royal Highnesses hope that The King's Cup will become an annual event, bringing greater awareness to the wider benefits of sport, while also raising support and funds for the causes that the Duke and Duchess report".
The duke trounced his wife when they competed in a dragon boat race in Canada in 2011, but Kate got her revenge three years later when she won a sailing event in Auckland during their tour of New Zealand.