After racing each other in yachts around Waitemata Harbour in Auckland, the couple were seen laughing, joking and generally only having eyes for each other, which is probably not so easy to do when the whole world is watching you.
William was seen holding his wife's hands while she laughed at something he was saying. Or perhaps she was gloating as her team won both races?!
Kate and William had earlier joined separate America's Cup crews for two races around the harbour with Kate's team coming out on top both times. She was even given the chance to lead the crew and steer.
Another photo shows Kate looking somewhat feisty as William gestures. We wonder if that has something to do with the fact he reportedly shouted, 'We were sabotaged' after his team lost.
Today was the royal couple's fifth day on their tour of New Zealand and Australia and, along with racing, it included meeting members of military families and touring an airforce base.
They will stay be on tour for three weeks.
Kate and William's eight-month-old baby son Prince George made his first public engagement appearance on Tuesday, joining other babies at a children's playgroup in Wellington and pretty much making everyone across the world melt with his cuteness.
Unfortunately, it's not thought George will be making any further appearances on their trip.
Kate and William have travelled from the UK with the baby's newly-appointed nanny, who will reportedly be looking after the prince away from the cameras as his parents get on with their duties.
Little George was born on 23 July 2013 and is third-in-line to the throne.
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