The couple - who were married from 1986 to 1996 and are parents to Princesses Beatrice and Eugenie - have remained famously amicable since their divorce and are even rumoured to have restarted the romantic element of their relationship.
The royal couple are said to live together, still sharing a home in Windsor Express.co.uk reports.
See Fergie and Andrew's most iconic and memorable moments below!
Since her unofficial welcome back into the Windsor fold at daughter Eugenie's wedding to Jack Brooksbank in October 2018, the flame haired Duchess appears to be closer to the second son of Queen Elizabeth than ever.
Rumours that they were back together began when the couple were spotted holidaying in Bahrain with their daughter Princess Beatrice and her new boyfriend Edoardo Mapelli Mozzi, leading enthusiasts to hope a second royal wedding may be on the cards for the pair.
"This is the royal wedding everyone wants to see again. ❤️," one fan wrote on Fergie's post.
"I just love that Sarah, The Duchess of York continues to be his #1supporter. This is how parents should be, married or unmarried. What an example!!!" another penned.