Body language expert Judi James told the Mirror: “As Kate and her three children watched from the open window, it was Kate standing at the back of the group while Charlotte beamed down with an expression of pride, even appearing to mutter to Louis to ensure he stood to attention as she did while the National Anthem was being played.”

During the ceremony, Louis was spotted playing around with the blind cords by the window instead of looking on. He was also seen yawning and dancing, jigging his hips from side to side and causing his mum Kate to laugh. The BBC commentator chuckled as the comical moment aired live on television: “He’s enjoying boogieing along to that.”

While Charlotte has been known to reprimand little Louis, she clearly adores her younger brother. “It’s so sweet seeing the three [siblings] together and particularly Charlotte being super protective of her little brother,” Sophie Mirman, founder of the British childrenswear brand Trotters.

Charlotte and Louis have always shared a special connection. In a photo released by William and Kate for Charlotte’s third birthday, she was pictured cradling a baby Louis in her lap and placing a sweet kiss on her sleeping brother’s head. The young princess also doted on her baby brother in portraits from Louis’ christening in 2018. While everyone else looks at the camera and smiles, the proud big sister is focused only on Louis as she lovingly gazes at him and holds his hand.

It’s by no means one sided. Proud dad William previously shared how Louis idolises his sister as he spoke about their morning routine. “Charlotte, particularly, is running around the kitchen in her dresses and ballet stuff and everything,” he said. “She goes completely crazy with Louis following her around trying to do the same thing.”