This Christmas season, Prince Louis is grateful for “granny and grandpa.”

Along with his siblings, Prince William and Kate Middleton’s youngest child attended his mom’s fourth annual “Together at Christmas” carol service at Westminster Abbey on Friday, where photographers caught a glimpse of his sweet handwritten note to his grandparents.

Before the concert began, the 6-year-old stopped at the “Kindness Tree,” on which guests were invited to hang messages in dedication to someone who’s supported them this year.

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“Thank you to granny and grandpa because they have played games with me,” the boy’s card read.

Louis and his 11-year-old brother, Prince George, matched their dad, 42, in navy suits, white dress shirts and red ties, while Princess Charlotte, 9, wore burgundy to complement Middleton, also 42.

The woman of the hour — who has hosted the event every December since 2021 — stunned in a bright red coat topped with a black bow, which she paired with a plaid skirt.

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Though all three royal kids carried handwritten notes to leave on the “Kindness Tree,” only Louis’ was visible.

“This year’s service provides a moment to reflect upon the importance of love and empathy, and how much we need each other, especially in the most difficult times of our lives,” Kensington Palace shared in a statement last month.

“The service will shine a light on individuals from all over the UK who have shown love, kindness and empathy in others in their communities, whether on a personal level with friends and family, through their work or as they selflessly give up their time through volunteering.”

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