Princess Anne is "sceptical" about King Charles' approach to the Royal Family, an expert has claimed.
The "popular" royal, who turns 73 today, reportedly has her qualms about the concept of a slimmed-down Firm.
Commentator Richard Fitzwilliams told the Daily Star that as one of the institution's most well-liked members, Anne still has a lot of sway – hinting Charles should heed her concerns.
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"Princess Anne has continued to be [one of] the most popular members of the royal family," he said, citing a YouGov poll from earlier this year.
"She has always been much respected for her hard work and dedication."
"Her scepticism about the concept of a 'slimline monarchy' seems absolutely justified as only four working members of the royal family are under 70."
The most recent YouGov polling shows the late Queen Elizabeth II is still the most popular royal, almost a year after her death.
In second place is the heir to the throne, Prince William, followed by birthday girl Anne.
Kate Middleton and Charles round out the top five, in fourth and fifth respectively.
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Fitzwilliams added while Anne may have her concerns, she will continue to put the Royal Family first and support her brother in his new position of power.
"She sees her role to support King Charles and does so wonderfully well," he added.
"Her work for Save the Children and her equestrian activities are justly famous. It is senior working members of the royal family like Princess Anne who give the royal family a very special cachet."
To mark the Princess' birthday today, the Royal Family's official X (formerly Twitter) account shared two images of her and King Charles.
"Wishing Her Royal Highness The Princess Royal a very Happy Birthday today!" the post read.
In the first snap, the duo can be seen at Buckingham Palace on the day of the King’s Coronation at Westminster Abbey.
Meanwhile in the second pic a two-year-old Charles holds his sister's hand at Clarence House in July 1951, weeks before her first birthday.
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