Princess Beatrice's daughter makes rare appearance at holiday event with royal family: See photo

The three year old is going to become a big sister in 2025

LONDON, ENGLAND - DECEMBER 19: Princess Beatrice of York attends a Christmas Lunch at Buckingham Palace on December 19, 2024 in London, England. (Photo by Karwai Tang/WireImage)

DECEMBER 19, 2024 1:11 PM ESTDEC 19, 2024, 1:11 PM EST

King Charles' 2024 pre-Christmas lunch was a family affair for Princess Beatrice and Edoardo Mapelli Mozzi. The couple attended His Majesty's luncheon at Buckingham Palace on Thursday, accompanied by their daughter Sienna Elizabeth Mapelli Mozzi and Edo's son Christopher Woolf. Sienna, 3, was spotted sitting in a carseat in the backseat of a vehicle driven by her father.

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Edoardo Mapelli Mozzi and Princess Beatrice leave after attending King Charles III's Christmas lunch at Buckingham Palace, London. Picture date: Thursday December 19, 2024. (Photo by Aaron Chown/PA Images via Getty Images)

Sienna, who is King Charles' great-niece, is set to become a big sister in the New Year. Princess Beatrice is pregnant with her second child. "Her Royal Highness Princess Beatrice and Mr Edoardo Mapelli Mozzi are very pleased to announce that they are expecting their second child together in early spring; a sibling for Wolfie, aged eight, and Sienna, aged three," Buckingham Palace revealed in October. "His Majesty The King has been informed and both families are delighted with the news."

While Beatrice and Edo joined members of the royal family at the pre-Christmas lunch on Thursday, it's been reported that they, as well as Beatrice's sister Princess Eugenie and her husband Jack Brooksbank, won't be celebrating Christmas at Sandringham this year. HOLA! USA's sister brand HELLO! has reported that it understands that it was decided earlier this year that the Princesses would spend the festive period with their respective in-laws for the first time since their marriages.

Jack Brooksbank and Princess Eugenie leave after attending King Charles III's Christmas lunch at Buckingham Palace, London. Picture date: Thursday December 19, 2024. (Photo by Aaron Chown/PA Images via Getty Images)

Like her sister, Princess Eugenie was at her uncle's lunch on Dec. 19. Princess Anne, Vice Admiral Sir Timothy Laurence, the Duke and Duchess of Edinburgh, and Prince and Princess Michael of Kent were among the family members in attendance. The Prince and Princess of Wales, along with their children, Prince George, Princess Charlotte and Prince Louis, were absent from the holiday event. After what has been an incredibly tough year, HOLA! USA understands that family wanted to start Christmas in Norfolk earlier that usual. The Waleses will be celebrating Christmas at Sandringham this year. William said last week, "It won't be quiet, it will be noisy."