Princess Charlotte is due to be granted one of the "grandest" royal titles after it was reserved for her by King Charles.
According to a new book written by veteran royal correspondent Robert Jobson, the seven-year-old's title will change from Princess Charlotte of Wales as she grows older.
And with her brother George's future already mapped out as King, the royal expert has written in his book - Our King Charles III: the Man and the Monarch - that Charlotte is in line to become the future Duchess of Edinburgh reports the Mirror.
He explains: "Sensitive to the fact that nine-year-old Prince George's future is already mapped out, Charles has been careful to reserve one of the grandest titles for Princess Charlotte – currently called Lottie by her mother and Mignonette (French for cute little thing) by her father."
"Although the King has made his brother Edward the new Duke of Edinburgh, the title is only for life. After Edward dies, Charles has made it clear Charlotte (now aged seven) should become Duchess of Edinburgh."
In March, the King granted the title of Duke of Edinburgh to his youngest brother Prince Edward, making his wife Sophie the Duchess of Edinburgh.
The announcement came in April, on Edward's 59th birthday with his new title which was previously held by his father the late Prince Philip.
It had long been known that Edward would one day become the Duke of Edinburgh after a pledge made by the late Queen on his wedding day in June 1999.
At the time, there were questions as to why he was given an Earldom rather than a Dukedom.
However, it was announced at the time of the nuptials that Edward would succeed his father as the Duke of Edinburgh with the blessing of his parents after his death.
The late Prince Philip was keen on Edward having the title in recognition of his son's decades-long commitment to the Duke of Edinburgh's Award, the youth scheme which is one of Philip's greatest legacies.
The dukedom – which in the past has been hereditary – will not, however, pass down to the Edinburghs' son James when Edward dies.
And explaining this in his book, Jobson writes: "Charles, determined to reduce the size of the Royal Family, wants such senior titles to be given only to its working members and stop it expanding further.
"The move by the King to focus on the line of succession is significant, as Charles III plans a modernised, slimmed-down monarchy."
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