Prince William's 40th birthday cemented him as an incredibly beloved member of the royal family. A quick scroll through the comments on his birthday post from Prince Charles shows just how important he is to royal fans around the world.

As for Kate Middleton, she is one of the most admired royals in the world today, with fans regularly praising her composure, genuine attitude, and impeccable fashion sense.

On the occasion of Prince William's 40th birthday on June 21, royal expert Richard Fitzwilliam commented on the Duke and Duchess of Cambridge's influence and senior royal status. And it is fair to say that if Mr. and Mrs. Cambridge had the biggest fans, the author would be at least in the top ten.

"Prince William's inspiration, as he says, is the queen," Fitzwilliam told the Daily Star.

"His partnership with Princess Catherine and the way they work together on charitable issues and international tours is perfect."

This expert, like many others, believes that the Duchess is a wonderful fit for William and has been a very positive influence on him.

"Catherine is not only wonderfully supportive, but she is also building his confidence, especially as a speaker. They are also the most glamorous royal couple in the world."

For Fitzwilliams, it is very important that the Cambridges are beloved symbols of the royal family. [The government uses [the Cambridges'] visits abroad to promote goodwill," he concluded.