Sarah Ferguson seemingly tests Queen Camilla's patience with powerful message

Prince Andrew's ex-wife Sarah Ferguson, popularly known as Fergie, has seemingly tested King Charles III's wife Queen Camilla's patience with her latest move.

Andrew's ex-wife Ferguson on Monday described Diana her "dear friend and "Kinder spirit" as she shared her adorable picture with the late Princess to show her love for Prince William and Harry's mom on what would have been her 63rd birthday.

Charles and Diana’s divorce was finalised in 1996. A year later, the Princess of Wales died in a car crash at age 36. While Charles and Camilla made their first public appearance in 1999, it would be a year later when the queen acknowledged the relationship. Charles and Camilla tied the knot in 2005. The queen didn’t attend the civil ceremony.

Princess Diana's biographer Andrew Morton, author of "The Queen: Her Life," told Fox News Digital: "There was considerable animus between the houses of the queen and Prince Charles over Camilla. [It was there] before [Princess] Diana died, and certainly after Diana died."

The author went on: "The queen and her advisers, her courtiers, her private secretary – they all believed that Prince Charles should give up Camilla."

Ferguson, in her latest post, wrote: "Happy birthday to my dear friend, Diana. You were a pillar of light and love. And what a legacy you have left behind. I will forever remember our laughter and the kindred, kind spirit I found in you. I am sure you are watching over us always. Rest in peace my friend."

Princess Eugenie's mom, while reflecting on what Harry's mother would be doing if she were alive today, previously told the Sun: "I think first and foremost she’d be hugging her grandchildren and so proud of both her sons and their wives."

Ferguson went on: "She’d be travelling between Santa Barbara and Kensington Palace. She would also be championing her causes when it came to children’s charities."

For several years the press and public have speculated over the true nature of the relationship between two royal brothers William and Harry, and the woman who Princess Diana allegedly considered a key factor in the breakdown of her marriage to Prince Charles. The Duke of Sussex has also expressed his anger bout Camilla in his interviews and book 'Spare'.