For the first time, all three of Princess Kate’s children joined her for the festive event

Prince Louis is spreading holiday cheer during his Christmas carol concert debut!

For the first time, Prince Louis joined his parents, Kate Middleton and Prince William, and older siblings, Prince George and Princess Charlotte, at the royal Christmas carol concert at Westminster Abbey.

The 5-year-old royal’s outing was likely especially meaningful for Princess Kate, as her whole family was there to support her in hosting the holiday event during its third year. After kicking off the new tradition in 2021, the Princess of Wales was joined by Prince George and Princess Charlotte last year.

Before heading into Westminster Abbey for the holiday event, George, Charlotte and Louis had an important task: mailing special letters. Children were encouraged to send Christmas cards and best wishes to other children who might be struggling this year. The trio headed over to a red mailbox outside the venue and dropped their letters inside before joining their parents for their entrance. According to royal reporter Rebecca English, George, Charlotte and Louis all wrote their own cards.

While Prince George, 10, and Princess Charlotte, 8, have accompanied their parents at royal events for several years, Prince Louis is only recently old enough for such outings. In 2019, George and Charlotte made their Christmas Day debut alongside the royal family for their annual walk to church services — and last year, Prince Louis joined for the first time!

Prince Louis also attended the biggest event on the royal calendar in recent years: his grandfather King Charles’ coronation in May!

He joined his parents and Princess Charlotte for the procession into Westminster Abbey, adorably holding hands with his big sister. (Prince George entered apart from the rest of his family as he was acting as a Page of Honor to his grandfather along with three other boys.)

Prince Louis and Princess Charlotte took in the spectacle of the crowning ceremony together, quietly whispering when something caught their attention. But in a relatable moment, Prince Louis was caught on camera letting out a big yawn. Although he left the crowning ceremony for a small portion, a move that was likely planned.

This year’s Christmas concert — featuring performances by Westminster Abbey’s choir, Adam Lambert, Beverley Knight and more as well as a reading given by Prince William — is linked to Princess Kate’s Shaping Us campaign, which focuses on her mission to support children during the early years of their lives. The palace said the event was organized to “thank all those who work to support babies, young children and families in our communities across the U.K. and a celebration of the golden opportunity that the birth of a new baby brings.”

The event will be broadcast as part of Royal Carols: Together At Christmas, airing on ITV1 and ITV X on Christmas Eve.