Sarah Ferguson has claimed that her hen night before she married was so raucous - she and Princess Diana ended up being arrested.
Fergie, who has been promoting her romance novel in the US, opened up about the incident, which she said happened after she and the late Diana decided to dress up as police officers.
Recounting the tale on the Kelly Clarkson Show on US TV, the 63-year-old said she and the princess had headed to a private members club with the costumes on for drinks but ended up being turfed out.
She explained: "We sat down, and the waiter came up to us and said, 'Excuse me, this is a members club. And it's for fun, and we don't serve police officers here'."
Kelly asked: "They thought you were real police officers?" to which Fergie replied, "Yes!".
However, the story did not stop there as Fergie said Diana broke character on leaving the club - and they were then arrested for impersonating police officers and thrown into the back of a police van.
Fergie says they even turned their engagement rings around on their hands so they wouldn't be noticed with Diana pinching smoky bacon crisps she found in the van.
But once it emerged who the two women were in the back of the van, they were eventually released.
Meanwhile, Fergie also reflected on her friendship with Diana, who she called Dutch, and said: "People always say to me miss you must miss Dutch.
"And I say no because she's with me all day. She and I, we laughed a lot."
Sarah has most recently co-written her second historical romantic novel co-authored with Marguerite Kaye, who has written more than 50 Mills & Boon books, which will be published on March 30.
A Most Intriguing Lady is inspired by Sarah’s relative Lady Mary Montagu Douglas Scott, who in the fictional tale is born into the highest society, fighting to define her place in life.
And in a separate interview, she said she would not judge Prince Harry and Meghan Markle on their decision to move to the US and publicise their lives.
The couple quit as senior working royals in 2020 in favour of more freedom and the ability to earn their own money in the US, before giving a bombshell interview with Oprah Winfrey in March 2021.
A controversial six-part Netflix series titled Harry & Meghan was released in December 2022 before Harry’s memoir titled Spare, which also contained a string of revelations, was published in January.
Fergie related her own experience of divorcing Andrew, the Duke of York in 1996 and giving an interview to Winfrey declaring that royal life was “not a fairy tale”.
She said: “I divorced, went to America, wrote a book, went on Oprah and did 12 years as the longest-running spokesperson of Weight Watchers.
“I looked to America to support me and to help me and I really can’t thank the American people enough for what they gave me and what they did for me.
“So, I believe very strongly that I have absolutely no judgment on any other person’s life, and I look at how much she (Meghan) loves him (Harry) and loves the children and gives him a love that he’s never had before. That’s how I look at it.”
