Sarah Ferguson sparked backlash with a glaring error in her tribute to Queen Elizabeth II.
The Duchess of York, 64, took to her various social media profiles to wish Her Late Majesty a happy birthday, as she would have celebrated her 98th birthday today.
However, Fergie, as the duchess is affectionately known, did not use the correct age in her post.
She wrote: "Today we are remembering Her Late Majesty Queen Elizabeth II on what would have been her 97th birthday.
Sarah Ferguson sparked backlash on social media
Getty / X
"Thank you for all that you have taught us, for being a steadfast leader and dear friend. You are sorely missed."
Royal fans immediately responded to Sarah to correct the former working royal.
One said: "Very missed indeed. She would have been 98."
Meanwhile, another simply wrote: "Correction, 98."
The Duchess of York shared this post about the late monarch on her social media
X / Sarah Ferguson
One fan sarcastically commented: "98th birthday, Sarah."
Another royal watcher added: "Dear Sarah, it’s the late Queen’s 98th birthday, born 1926 I have always read."
One said: "I'm sure it is her 98th birthday, born April 21, 1926. Happy heavenly 98th birthday Ma'am."
A social media user wrote: "You made a big mistake."
Queen Elizabeth II would have celebrated her 98th birthday today
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Queen Elizabeth II and Sarah Ferguson photographed in 1991
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Another added: "Err..98..!!" with several angry emojis.
However, others came out in defence of Princess Beatrice and Eugenie's mother, insisting it was a typo.
One person said: "To all those correcting Sarah Ferguson, I'm sure she knows exactly how old HM Queen Elizabeth would have been. It can only be a typo."
Sarah previously described the late monarch as her "total idol".