Prince Louis' "face lit up" after spotting a famous actor at Kate's Christmas carol concert.
The Princess of Wales held her third annual Christmas carol concert on December 8, which aired on TV on Christmas Eve.
Prince Louis, five, made his debut at his mother's annual concert this year, having never attended before.
His older two siblings, Prince George, 10, and Princess Charlotte, eight, made their debut in 2022.
Prince Louis' 'face lights up' after spotting famous actor at Kate's Christmas carol concertITVLittle Louis, who is infamous for his cheeky facial expressions during royal events, was on his best behaviour throughout the concert.
But royal fans pointed out that his face "lit up" when he saw a famous actor take to the pulpit to read the Letters from Father Christmas by J.R.R. Tolkien.
The five-year-old looked up at Princess Kate and could be seen saying "Mama" in excitement.
One fan wrote on social media platform X: "That was such an adorable moment... the look on his face."
Prince Louis arriving at Westminster Abbey
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Another noted: "'Mama' from Prince Louis."
A third wrote: "Aw so sweet!"
Similarly, someone said: "He's such a cutie."
"Look how excited Prince Louis was to see Jim Broadbent it was lovely," a royal watcher commented.
Prince Louis with his older two siblings, George and Charlotte
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Prince Louis attempting to blow out his candle
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A fan replied to a clip on social media saying: "We noticed that too!"
"The Christmas magic in his eyes!" a social media user posted.
In addition, a fan said: "His little face lit up."
Another added: "It was lovely to behold. All the other children in the Abbey plus parents seemed quite engaged during the reading too."