The Queen's grandaughter walked into St Mary Magdalene Church in Sandringham alongside the Duke and Duchess of Cambridge , George, Charlotte, Louis, Prince Charles , Princess Anne and other relatives - but she broke a big royal tradition in doing so.
She was accompanied by her millionaire property developer fiancé Edoardo Mapelli Mozzi - even though he's not officially a Royal yet.
Invites to the Royal Family's private Sandringham celebrations are reserved for members of The Firm, and partners normally have to wait until they are married to join in.
However Prince Harry broke this tradition in 2017 by inviting his bride-to-be Meghan Markle ahead of their wedding, paving the way for Beatrice to do the same with Edo.
Beatrice wore a smart tan coat with a green headband and black boots and gloves for the Christmas service, while Edo looked smart in a black suit with a grey tie.
Meghan joined the Royals for the 2017 three-day Norfolk celebration as her own family were miles away in America.
Although breaking traditional protocol, PR advisors insisted it was a necessary gesture to avoid ill feeling or, worse, a PR storm.
Kate Middleton and Mike Tindall on the other hand had to wait until they had their Welsh gold rings firmly on their fingers before being allowed to tuck into that royal turkey.
Speaking at the time, royal expert Richard Fitzwilliams told Express.co.uk : "In 2010 Kate was not invited to do so after her engagement to William nor was Mike Tindall after his to the Princess Royal's daughter Zara Phillips and only spouses and close family are usually invited.
"However Harry and Meghan will be living together at Nottingham Cottage at Kensington Palace and her family are in the United States. The monarchy relies heavily on precedent and tradition but it also makes its own."
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