Sarah Ferguson once famously described her and Andrew Mountbatten Windsor as 'the happiest divorced couple in the world'.
The pair - parents to Princess Beatrice and Princess Eugenie - divorced in 1996 but continued to live together at Royal Lodge in the years that followed.
And Sarah was a staunch supporter of the former Prince, previously describing him as a "kind and good man" and "the best man I know" in various interviews.
But their once rock-solid bond has been shattered over their connections to Jeffrey Epstein.
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Both Sarah and Andrew lost their major honours and titles following revelations about their ties to the convicted paedophile. They were also instructed to leave Royal Lodge.
Andrew, 66, now lives at Marsh Farm, a five-bedroomed property on the King's Sandringham estate. Sarah, meanwhile, has spent a great deal of time outside the UK, although according to the latest reports, she is now thought to be renting a six-bed gated property somewhere in the Home Counties.
The 66-year-old has been keeping a low profile, and while many thought she was keen to keep her distance from Andrew, it seems the opposite is true.
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A source has now told The Times: "The red setter, as she's known, is not welcome at Marsh Farm. She's persona non grata as far as Andrew is concerned."
It's not known why she has been exiled by her ex-husband, but the cache of Epstein documents released in the US appear to show it was Sarah who introduced Andrew to Epstein.
The source also refuted speculation that Andrew is wallowing in his own company. "Don't believe all that poor Andy c**p. He's having a very nice time, thank you very much. He goes out, he goes off shooting with friends, he sees his old chums who are very loyal to him. He's not sitting around feeling sorry for himself any more."
Sarah sets the record straight on tell-all memoir claims
Sarah is "not writing" a tell-all personal memoir to "rescue her reputation", contrary to reports.
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A spokesman for the former Duchess previously denied that she is considering a seven-figure payout to write a tell-all autobiography, following reports that she is "days away" from a book deal.
"There have been no discussions, and she is not writing a personal memoir; it's not what she's going to do," he said.
A report in The Sun claimed that Fergie's "compelling" memoir would discuss "key subjects" such as her ex-husband Andrew, as well as King Charles, Prince Harry and Meghan Markle.
The paper also claimed that she wanted to "settle concerns" over her friendship with Jeffrey Epstein, for which she has been scrutinised and exiled from public life.
All the latest on Sarah's return to the UK
It was reported last month that Sarah was planning to return to the UK – six months after her eviction from Royal Lodge in Windsor, the home she shared with ex-husband Andrew.
However, the mother of two has not been publicly sighted in Britain.
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She was said to be moving into a £10,000-a-month, six-bedroom gated property in the Home Counties after spending the first half of the year unaccounted for, aside from being spotted twice in Austria and Switzerland.
It's possible that she was financially motivated to return, or hopes to spend time with her daughters Princess Beatrice and Princess Eugenie, who welcomed her third baby last month.
Speaking on A Right Royal Podcast, HELLO!'s Royal Editor Emily Nash said: "I think the fact that she's come back now is really interesting. And there are a couple of things that could be behind it.
"One, she may potentially have inherited some money from her great friend whose property she was staying in in Switzerland (Paddy McNally).
"But I think probably the key thing for her will be her grandchildren and wanting to spend more time with them. She's just welcomed a new granddaughter, Adelaide.
"And while Eugenie and Jack Brooksbank are based in Portugal, they do come back and forth. But she also has Beatrice's children. And what grandmother doesn't want to be closer to them? She can't live in exile forever."