Kate was talking to former world and Commonwealth champion James Hickman when she admitted that she often takes George swimming.
Could Prince George be the next royal Olympian?
James, who is from Manchester and won the world championships five times, met Kate at a SportsAid charity meeting on Tuesday.
Speaking to ITV, James added: "So, maybe he could be the next royal to take part in the Olympics, and if he was in swimming that would be incredible."
The Duke and Duchess of Cambridge at the 2014 Commonwealth Games
George's godmother Zara Phillips won silver at the London 2012 Olympics in the team eventing discipline.
The young Prince, who celebrated his first birthday on 22 July, has been described as "quick on his feet" by the Press Association photographer who took the official pictures for George's birthday, and it seems the little one may also be quick in the pool.
Kate regularly takes George swimming at Buckingham Palace, and it is thought this is where the two went on the morning of his birthday.
The Duke and Duchess have been attending the 2014 Commonwealth Games
Speaking after he put on his aqua gear at the British Sub-Aqua Club (BSAC) gathering earlier this month, he joked: "At the moment bath time is quite painful, but hopefully donning a snorkel and mask might calm him down."
Kate couldn't hide her emotions on Monday as she attended the fifth day of the 2014 Commonwealth Games being held in Glasgow.
Taking in a boxing match and a hockey game, Kate winced, laughed, and held her hands tight in suspense as she visted the Games with William and Prince Harry.