The Duke of Cambridge, 40, posted the video on Instagram on the joint account he shares with his wife, Kate Middleton, also 40. In the short clip, William and his only daughter Princess Charlotte, 7, are seen hugging and sending a special message to the Lionesses, England’s women’s national football team, who face Germany in today’s final. In the video, William says, “We both want to wish the lionesses the best of luck tonight. You’ve done incredibly well in the competition and we’re rooting for you all the way.” A very grown-up Charlotte then chimes in, “Good luck. I hope you win. Bye.” Oh, and then she gives Charlotte’s signature. NBD. This message – while surprising because we get a glimpse of the young royal household – shouldn’t come as too much of a shock to those who follow the duke’s social media accounts closely. William has posted several times with personal messages about the lionesses ahead of the final. How did we know the messages were ‘personal’ from the duke and not just written by social media managers? Because they bore his unique signature, of course. William and Charlotte’s interest in the sport has been known for some time. After all, he is the President of the Football Association (FA) in England. He has held the position, previously held by his late grandfather Prince Philip, since 2006. And when the duke visited the Lionesses in June, he was presented with three football shirts with his children’s names on the back. When he saw Charlotte’s, he mentioned that he is a “budding star for the future”, saying that he wanted to tell the team that he is a good goalkeeper. But eagle-eyed royal fans likely also spotted a nod to Charlotte’s mother Kate in the new video. The Cambridge middle is seen wearing a polka dot outfit very similar to what Middleton wore to Wimbledon this year. The story continues In fact, the Duchess of Cambridge has worn polka dots eleven times in recent memory, making it clear that the pattern is her favorite. Charlotte clearly shares an affinity for polka dot fashion. What a treat to see Charlotte follow in William and Kate’s footsteps on the same day. Stay up to date with every royal family story, subscribe here. RELATED: Prince William shares touching message of support for UK soccer player who came out as gay