She has experienced the ups and downs of life in the limelight - from a fairytale royal wedding to her infamous "toe-sucking" scandal and Oprah Winfrey show confessional.
The duchess reportedly has a strained relationship with the Duke of Edinburgh, who she claimed in a tabloid interview once labelled her "odd and pointless".
And she has found herself on the fringes of royal life, finding it "difficult" to cope with being left off the Duke and Duchess of Cambridge's wedding guest list, and allocated a seat far from her family and senior royals when invited to the Duke and Duchess of Sussex's nuptials.
But she will be playing a starring role for the wedding of her daughter Princess Eugenie and Jack Brooksbank on October 12 in St George's Chapel at Windsor Castle.
Sarah Ferguson was born on October 15, 1959 to Major Ron Ferguson and Susan Barrantes and can trace her ancestry back to royalty.
The Duke and Duchess of York smile happily after their wedding at Westminster Abbey in London. Source: AAP
A young Sarah - dubbed Fergie by the media - grew up around royalty as her father played polo with the Duke of Edinburgh and was polo manager for the Prince of Wales.
It is said romance blossomed between the boisterous redhead and the Duke of York in the mid-1980s thanks to scheming by an unlikely matchmaker - Diana, Princess of Wales.
The couple wed in 1986 and had two daughters, Princess Beatrice born in 1988 and Princess Eugenie two years later.
Royal life with its protocols and procedures stifled the exuberant duchess and the long periods that her husband Andrew spent away with the Royal Navy did not help their marriage.
The pair split in 1992 and that year the infamous photograph showing American John Bryan sucking her toes was published by a tabloid newspaper.
The duke and duchess divorced four years later but the break-up was amicable and they both played important roles in the lives of their daughters.
In the years that followed, Sarah was said to have struggled with money problems.
She turned her finances around by working in America, including acting as a spokeswoman for Weight Watchers for 10 years from 1997 and writing a series of children's books and self-help and lifestyle guides.
But in 2010 she was caught up in the cash-for-access scandal, offering to sell an introduction to her ex-husband for £500,000 to an undercover reporter posing as a businessman.
After the scandal broke, Sarah was interviewed by US chat show queen Winfrey and said about Andrew: "We are divorced and I don't want to keep being this burden on him."
But the couple has remained close and are said to still live together at Royal Lodge in Windsor Great Park.
The Duchess of York arrives for the wedding of Meghan Markle and Prince Harry. Source: Getty Images
Speaking ahead of the wedding to the BBC's The One Show, the duchess said about the planning for the event: "Jack and Eugenie are very contemporary, they are very inclusive, and they are all about love, and they want this wedding to be about that - to include everybody and to really absorb the love they have for each other with everybody else."
