They're both highly ambitious women who married into the royal family under enormous pressure - before leaving to rebuild their lives in the US.
But it seems the obvious similarities between Sarah Ferguson and Meghan Markle haven't forged a firm friendship between the two women.
In fact, the Duchess of Sussex and Duchess of York have had a rather bumpy relationship since they were first introduced in October 2016.
After making things official with Meghan, Prince Harry claimed he wanted Fergie to be the first royal to meet her - and the group even enjoyed drinks at the Royal Lodge together.
However despite Meghan's close friendship with Fergie's daughter Eugenie, and the fact they have attended a number of weddings, as well as the Queen's funeral, together, Sarah this week claimed she 'doesn't really know' the Duchess of Sussex.
Relations between the Duchess of York and Meghan Markle appear to have been bumpy over the years - here FEMAIL reveals the ins and outs of their relationship (pictured together, at Princess Eugenie's wedding in 2018)
Earlier this week,despite Meghan's close friendship to Fergie's daughter Eugenie, and the fact they have attended a number of weddings, as well as the Queen's funeral, together, Sarah this week claimed she 'doesn't really know' the Duchess of Sussex
In the Oprah interview, which was broadcast in early 2021, the Duchess of Sussex said Fergie was the person who taught her to curtsey.
She claimed when she went to meet the Queen for the first time at The Royal Lodge in Windsor, she 'didn't even know how to curtsey' and was shocked when Harry explained it was expected of her.
Meghan said: 'I went into it naively because I didn't grow up knowing much about the royal family. I didn't fully understand what the job was.'
The mother-to-be said that was the moment 'the penny dropped' that her perception about the Firm was 'very different' to the reality, and she had to learn how to perform the royal custom 'very quickly'.
She said:'I didn't know I was going to meet her until moments before. We were in the car and we were going to the Royal Lodge for lunch, and he [Harry] was like, 'Oh, my grandmother is here, she's gonna be there after church.'.
'Right in front of the house we practiced and ran in. Fergie ran out and said, 'Do you know how to curtsy?',' she recalled.
'Apparently I did a very deep curtsy, I don't remember it, and then we sat there and we chatted.
Meanwhile Harry also recounted a similar story in his book Spare, writing that he had actually hoped Fergie would be the first member of the family Meghan would meet as his girlfriend.
He wrote it was October 2016, explaining: 'First stop, Royal Lodge. To meet Fergie, because Meg already knew Fergie's daughter Euge, and Jack, so this seemed a logical baby step.'
In what many saw as an olive branch to Fergie after years of being snubbed from royal events, the Duchess of York was invited to Prince Harry and Meghan's wedding in 2018
In their explosive Oprah Winfrey interview in 2021, Prince Harry and Meghan claimed Fergie taught the Duchess how to curtsey
He added: 'Fergie came outside, somewhat aflutter, and said: 'Do you know how to curtsy?' Meg shook her head. Fergie demonstrated once. Meg imitated her.
'As we walked towards the door Fergie and I both leaned into Meg, whispering quick reminders.When you first meet the Queen it's Your Majesty. Thereafter it's just Ma'am. Rhymes with ham. Just, whatever you do, don't talk over her, we both said, talking over each other.'
After Meghan met the Queen, Harry writes that they stayed at Royal Lodge for drinks.
It is unknown what other occasions the two women might have crossed paths privately - however there were just a few occasions in which they were seen in public at the same events.
In what many saw as an olive branch to Fergie after years of being snubbed from royal events, the Duchess of Yorkwas invited to Prince Harry and Meghan's wedding in 2018.
Speaking about what was going through her head on Good Morning Britain, she explained: 'I felt like I was really happy for my friend Diana, who I love, and my mum and dad, and I felt honoured and grateful for Harry and Meghan to invite me.
'It was very kind of them and I think I can't thank them enough for doing that because it was nerve-wracking but I knew I was ready.'
However, according to National Post, she was left 'deeply upset' to be excluded from the 'inner sanctum' evening reception at Frogmore House.
Meanwhile Fergie claimed she had spoken to Meghan at the Queen's funeral, calling her 'beautiful'
The two women were sat on opposite sides of the aisle during the funeral service for the Queen (pictured)
The guest list was said to be controlled by Harry's father, Charles.
It's likely the Duchess' also crossed paths at Eugenie's wedding that October.
However Prince Harry and Meghan took the opportunity to announce their pregnancy at the event, something which royal reporters said left Fergie furious.
In their book Royals at War, investigative journalists Dylan Howard and Andy Tillett said: 'Meghan put her foot in it when she decided that it would be the ideal moment to announce that she and Harry were expecting their first child.
'This was a huge social gaffe, even if you were not a royal – stealing the limelight from Eugenie, who was furious, as was her mother, Sarah.'
Rumours of bad feeling went into overdrive when Princess Eugenie's mother tweeted a picture of her royal wedding outfit at the exact moment the Duke and Duchess of Sussex announced they were having a baby on October 15 2018.
Kensington Palace officially revealed the pregnancy at 8.40am on what was the 59th birthday of Eugenie's mother Sarah Ferguson, Duchess of York.
Prince Harry and Meghan have claimed on a number of occasions that it was Fergie who taught the Duchess to curtsey to the Queen
And at the exact time of the announcement, Sarah posted a tweet thanking the designer of her dress for the outfit worn on her daughter's big day just days earlier.
She then posted three further messages saying how 'proud' she was of her daughter and new son-in-law Jack - but made no mention of Harry and Meghan.
However byJuly 2021, the air seemed to have cleared somewhat.
The Duchess of York said she is 'a great supporter of Oprah Winfrey' as she discussed Prince Harry and Meghan's 'truthbomb' interview about Megxit.
Fergie now revealed Oprah 'helped her greatly' when she was interviewed by her in the US, telling The Telegraph: 'I'm a great supporter of Oprah and everything that she does...I wouldn't presume to give advice to the Duke and Duchess of Sussex except to say to be happy.'
Elsewhere in the same interview, Fergie touched on the challenges that Harry and Meghan have faced, saying: 'I did have to make my own way in the world when I left the family, and it is not always easy.'
Despite her kind words for Meghan and Harry, Sarah wasn't one of the 40 stars to be chosen to take part in the Duchess'40th birthday video and 40x40 initiative.
And in November 2021, Princess Eugenie held a christening for her son August in Windsor.
It's not believed Prince Harry and Meghan attended the family event, although it's not believed they travelled from the US for the occasion.
After Meghan revealed her pregnancy to family members at Princess Eugenie's wedding, Fergie was said to be 'furious'
And while Harry and Meghan did travel to the UK for the Queen's Jubilee events in June, Sarah has not attended the event in a number of years.
It's believed their next interaction came in September 2022, when theyalso both attended the Queen's funeral in September, and Fergie recalled speaking to Meghan at the event.
Fergie said she did speak to Meghan at the Queen's funeral in September, adding: 'She looked absolutely beautiful. I think she is beautiful.'
She has also said she wouldn't judge the Sussexes for their decision to quit as working royals - having a lot of experience in that department.
Earlier this month, she told the Daily Mail: 'I don't believe that any single person has the right to judge another person. I'm not in a position myself to make any judgments.
'I have been judged all my life, and I have no judgment on the Sussexes.'
However in March 2023, theDuchess of York, 63,the mother of Princesses Beatrice and Eugenie, told The Telegraphshe 'doesn't know' Meghan.
The mother-of-two said: 'I don't really know Meghan. I haven't really met her.'
Despite the two appearing to disagree on how much they have come into contact, Sarah has been complimentary of Meghan on multiple occasions.
In the same Telegraph interview, she praised the Duchess for 'making Harry happy', saying: 'She has made Harry very happy, and that is so nice. Honestly, he's so happy with her. She really loves him. And I think that's beautiful.'
Sarah's daughter Eugenie is a close friend of the Sussexes, and has visited them a number of times in the US (left). Fergie is extremely close with her daughter (right)
There are a number of other factors which could have impacted Fergie and Meghan's relationship.
Sarah's daughter Eugenie is a close friend of the Sussexes, and has visited them a number of times in the US.
However Harry has also been highly critical of Sarah's ex-husband Prince Andrew, with whom Fergie still enjoys a close relationship.
He became the first royal to publicly criticise Prince Andrew, 63, labelling the Jeffrey Epstein affair 'a shameful scandal'.
No one in 'The Firm' had spoken about claims the Duke of York twice sexually assaulted Virginia Giuffre, who claimed she was trafficked by Epstein.
Andrew settled her lawsuit last year, accepting no liability, and has always denied any wrongdoing. But Harry brings up the affair in his book Spare.
Fergie vs Markle: A history
October 2016 - Harry invites Meghan to meet Fergie at Royal Lodge as a 'baby step' before meeting other royals.
Harry and Meghan claim Fergie taught the then-actress to curtsey to the Queen.
Harry claimed that after the Queen left, he and Meghan stayed for drinks
May 2018 - Fergie is invited to Meghan and Harry's wedding
October 2018- Harry and Meghan are invited to Fergie's daughter Eugenie's wedding
The couple told family their pregnancy at the event, with reports afterwards stating Fergie was 'furious' by the social faux pas.
They later announce the news to the public - on Fergie's birthday.
July 2021 - Fergie says she is a huge fan of Oprah, months after Harry and Meghan's explosive interview
November 2021 - Princess Eugenie christens her son August, but it's not believed Prince Harry and Meghan attended
September 2022 - Harry and Meghan, and Fergie, attend the Queen's funeral.
Fergie reveals she spoke to Meghan at the event, and calls her beautiful.
March 2023 - Fergie says she 'doesn't really know Meghan' and 'hasn't really met' her
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