The Princess Royal sits as the third favourite among the wider population, behind the future King and Queen, William and Catherine
The Princess Royal now boasts a net worth upwards of £20million, a royal author has claimed.
Princess Anne, often described as the hardest-working royal, has continued the unmatched dedication to her duties, despite being set to turn 76 next weekend.
The late Queen's only daughter accumulated a whopping 478 engagements last year alone, adding to her lifetime tally that has now surpassed the 11,000 mark.
The commitment to the monarchy has earned her a considerable fortune of between £15million and £20million, royal expert Norman Baker has claimed.
"Notwithstanding her advanced years, she regularly tops the poll as the royal who carries out the most public engagements, putting younger royals like Prince William to shame," Mr Baker, author of And What Do You Do? What The Royal Family Don't Want You to Know, told the Daily Mail.
"This year alone, she has visited South Korea and Thailand to strengthen diplomatic ties, attended the Commonwealth Games in Edinburgh, and undertaken trips to destinations as varied as Milan, Northern Ireland, and Jersey.
He added: "She has also over the years quietly put together a small fortune, and is thought today to be worth between £15 and £20million."
After 57 years of exceptional service, Anne has rightfully established her position as one of the most popular royals.
In recent YouGov polling, the Princess Royal sits as the third favourite among the wider population, behind the future King and Queen, William and Catherine.
Her devotion was evident yet again this week, when she delayed her summer holiday to join sailors and spectators on the Isle of Wight, celebrating the 200th anniversary of Cowes Week.
She also visited Edinburgh on Wednesday morning, attending rehearsals for the Royal Edinburgh Military Tattoo at Redford Barracks.
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Perhaps this was down to the fact she lost her title as the hardest worker in the family last year, after older brother King Charles recorded an astonishing 532 engagements - despite ongoing cancer treatment.
While Mr Baker put her fortune down to her work ethic and nature - noted as "notoriously frugal" - he pointed specifically to four aspects.
"First and foremost is her house, Gatcombe Park, given to her and her then husband Mark Phillips by the late Queen in 1976," he explained.
"This Grade II listed building dates from the 1770s, and is actually only six miles from Charles’s beloved Highgrove House.
"The house boasts nine bedrooms, four reception rooms, a library, a billiard room, and a conservatory. It is thought to be worth upwards of £6million today, though any house with a royal connection can expect to add a premium to the selling price.
"Besides the house, Anne has amassed over the years an impressive and expensive collection of jewellery, as indeed all female royals do. The collection, which includes a pearl necklace worth £1million and a dazzling collection of tiaras, is estimated to be worth a further £5million in total.
"Thirdly, she has her inherited wealth, benefiting from trusts established for her, most notably by the late Queen Mother. The royals take great care to ensure wealth is passed down the generations with the minimum possible amount of tax paid.
"Lastly, she receives from Charles, and before him his mother, a generous allowance to reflect the work she does. By the turn of the century, this was already £225,000 a year, and of course the cost of expenses such as travel are met on top of this."
