The Duke and Duchess of Cambridge raced each other on yachts in Waitemata harbour off the coast of Auckland, in New Zealand, on Friday.
The Duchess raced with Team New Zealand's America Cup captain Dean Barker.
Everyone seemed very relaxed before the start of the racing.
The Duchess of Cambridge appeared to be enjoying the weather.
But when it came to the racing, it was game faces all round.
"If I bend down will it make this thing go faster?"
Unfortunately for Prince William, his wife won both their races.
Which she seemed to really enjoy.
She tried to console her husband.
But really she took great joy in her victory.
The royal couple received a memento of their time on the water.