Kate Middleton on why Prince Louis pulled off a Christmas surprise for Princess Charlotte.

Prince George, Princess Charlotte, and Prince Louis don't make many public appearances, but when they do, royal watchers get to see plenty of adorable moments. The royal trio headed to their mother, Princess Kate's, annual Together at Christmas carol concert on Friday, December 6, and during the event, the mother of three revealed a sweet story about how Louis kept secrets from his sister.

According to singer Paloma Faith, who performed at the concert, the princess shared how she enlisted Prince Louis' help to create a special moment for 9-year-old Charlotte. Dancers from the Royal Ballet performed during the carol service, and apparently Princess Kate wanted Charlotte, who is a big ballet fan, to have a magical holiday surprise when they appeared.

In a video shared by Sky News on TikTok, Princess Kate said, “Louis knew the dancers and they were talking over tea.”

The 6-year-old asked, “What's your secret?” she asked, so her mother told him the surprise on one condition. [Because I want it to be a surprise for Charlotte, who loves the ballet. And he said, I promise, I promise, I won't say anything.”

If you've ever counted on a six-year-old not to ruin a surprise, you're probably shocked to learn that Louie is an excellent secret keeper. When I proudly told Faith, “He's been keeping secrets for, I don't know, maybe two weeks,” Faith replied, “It's very rewarding.”

But before Louis could spill the surprise, he almost missed the concert and asked his mother on his way to school if he could reveal the dancers' participation. Then, in the morning, he asked, 'Mom, can I tell her? '” revealed Princess Kate. 'I dropped him off and picked him up, and he really wanted to tell me. I think, hopefully, he's keeping it."

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The royal added, “I don't think he said anything.”

Along with an endearing story about Louis' ability to keep secrets, the Princess of Wales, who announced her cancer diagnosis in March, mentioned her own health struggles to Faith. In a TikTok video, she said, “I didn't know this year was going to be like this.”

“Unplanned,” Faith replied. Princess Kate agreed, “Unscheduled, exactly. But I think a lot of people have had such a difficult time this year, and so have a lot of people here today.”