Prince William and Kate Middleton might soon start a major fashion trend when they wore matching blue pullovers at the first round of the America's Cup World Series which was held in Portsmouth, England.

In an interview with Hello, the Duke of Cambridge praised his wife for doing a good job in motherhood.

He said, "It is fantastic having a lovely little family and I am so thrilled. And Catherine has been doing an amazing job as a mother and I'm very proud of her."

The father-of-two just started his first day as an air ambulance pilot when he opened up about the wonders of having a family. He likewise told the publication that juggling two children is not easy.

"It has been fantastic and she has been a little joy of heaven. But at the same time it is more responsibility, looking after two little ones, especially when George is around. He's a little monkey," he joked.

When asked if there's a possibility for Prince William and Kate Middleton to have baby number three, he said, "We've only just had the second one. You never know what is going to happen in the future."

Prince William's perception about kids might have changed because in 2012, the Duke of Cambridge told a crowd in Singapore and Malaysia that he would only like two children.

The royal couple's firstborn, Prince George, is older than Princess Charlotte by 21 months. This age difference is similar to Kate and Pippa Middleton's as well as Prince William and Prince Harry's.

However, the Duchess of Cambridge's uncle, Gary Goldsmith, believes that the royal couple will have at least three kids. India Hicks, one of Prince Charles's cousins, also told People that Prince William and Kate Middleton might have baby number three.

"I think Kate and William could have the perfect ending with a boy and girl. But I suspect they won't stop there," she said.