Princess Beatrice broke royal tradition last Christmas after Prince Harry and Meghan Markle paved the way.
She married Edoardo Mapelli Mozzi, who has been a family friend since he was a child, in July this year.
He had already taken part in the royal family’s Christmas celebrations last year, the Mirror reports.
It happened though tradition says he shouldn't actually have been there.
Invites to the 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.
But Prince Harry broke this tradition in 2017 by inviting his bride-to-be Meghan ahead of their wedding, paving the way for Beatrice to do the same with Edo.
On Christmas morning, the Queen and her relatives normally come together for a service at St Mary Magdalene Church in Sandringham, Norfolk.
They usually head back to the estate afterwards for their private festivities.
Prince George and Princess Charlotte made their debut last year.
Millionaire property developer Edo was also there, having becoming engaged to Beatrice in September.
Meghan joined the royals for the three-day Norfolk celebration in 2017 as her own family was miles away in America.
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Despite breaking traditional protocol, PR advisors insisted it was a necessary gesture to avoid ill feeling or a PR storm.
Kate Middleton and Mike Tindall on the other hand had to wait until they were married before joining.
Royal expert Richard Fitzwilliams said although the monarchy relies heavily on precedent and tradition, it also makes its own.
Beatrice and Edo announced their engagement in September after a whirlwind romance, with him popping the question during a luxury holiday in Italy.
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The couple said: "We are extremely happy to be able to share the news of our recent engagement.
"We are both so excited to be embarking on this life adventure together and can't wait to be married.
"We share so many similar interests and values and we know this will stand us in great stead for the years ahead, full of love and happiness."
Their original wedding plans were cancelled due to the coronavirus pandemic.
They eventually managed to have a lockdown-friendly small ceremony in Windsor later in the summer.
A handful of guests joined the couple for the day, including the Queen and Prince Philip.
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