Sneaky little Louis.
Prince Louis once again stole the spotlight while attending a royal event. This time, he decided to blow out his sister Princess Charlotte’s candle at mom Kate Middleton’s third annual Christmas carol concert.
The 5-year-old’s hysterical moment took place at Westminster Abbey on Friday.
Louis and Charlotte, along with big brother Prince George, arrived at the concert with their parents, Prince William and the Duchess of Cambridge, both 41.
George, 10, Charlotte, 8, and Louis walked into the 1,000-year-old church and stopped by a ruby-red mailbox where they slipped in handwritten letters to Santa Claus.
While the couple’s two older children attended the festivities last year, Louis made his holiday debut on Dec. 8.
Other members of the Firm also appeared to show support for the Prince and Princess of Wales, including Princess Anne’s son Peter Phillips’ two daughters, Savannah and Isla.
Princess Beatrice and her stepson Christopher Woolf, whom she shares with husband Edoardo Mapelli Mozzi, enjoyed the evening of singing red-and-green coated classics, too.
King Charles and Queen Camilla, meanwhile, were not in attendance. The couple were at an engagement at his Highgrove estate in Gloucestershire, more than 100 miles away.
However, the monarch, 75, attended the concert in 2022.
The event involved a medley of musical performances by Westminster Abbey’s choir, Adam Lambert, Beverley Knight and more.
The bash is part of Middleton’s Shaping Us project, a mission to support children during their early developmental stages.
William, Louis and George matched in crisp navy-blue suits, while Charlotte sported a dark-red coat and stockings.
Middleton shined in an all-white ensemble, rocking a long coat, slacks, top and pumps.
The family outing comes just days after Omid Scobie’s bombshell tell-all “Endgame: Inside the Royal Family and the Monarchy’s Fight for Survival” hit bookstores.
In the Scobie’s book, the royal expert penned that there were two members of the Windsor clan who asked about the skin color of Meghan Markle and Prince Harry’s son before he was born.
The two people in question were allegedly Middleton and Charles, according to Piers Morgan.
The royal family have remained mum amid the scandal, while William and Middleton are said to be just too exhausted to release a statement or react in any form.
The mother of three was also reportedly “saddened” to hear that her moniker had been mentioned at all.
“Kate was 100 percent not one of the people who discussed [Archie’s skin],” a source told Us Weekly recently. “She is saddened that her name got pulled into this because she had nothing to do with it.”
The Christmas concert wasn’t the only joint appearance Middleton made with her kids this month.
On Dec. 2, she brought Charlotte and Louis to a taping of “Strictly Come Dancing,” UK’s version of “Dancing With the Stars.”
Middleton “took pictures of the children in the judges’ seats,” a source told the Sun on Monday.
“She seemed really relaxed and was all smiles,” the insider added. “She was polite, sweet and charming with everyone and made sure Louis didn’t get over-excited.”