Sarah Ferguson and Prince Andrew have been reunited to see their youngest daughter, Princess Eugenie, marry her long-term partner Jack Brooksbank.
Despite divorcing 22 years ago, Andrew and Fergie are still very close and supportive of one another.
While all eyes will undoubtedly be on Eugenie and who she is wearing, here we take a look back at the Duchess of Yorks wedding day and what she wore to marry her prince.
Sarah and Andrew married on Wednesday 23 July 1986 in Westminster Abbey.
Her dress was designed by Lindka Cierach, her gown was created from duchesse satin and featured heavy beading. 17 feet.
Wedding dress fever had swept the nation so much by this point that copies of Sarahs dress were being sold in stores hours after her wedding.
Andrew and Sarah announced their engagement on Wednesday 19 March 1986. Andrew proposed with a stunning deep red Burmese ruby stone, which was surrounded by 10 pear cut diamonds and sits on a yellow gold band.
Also created by Garrard & Co, it was designed by Prince Andrew himself.
He is believed to have selected the ruby to complement Sarahs red hair.
Deborah Papas of Prestige Pawnbrokers estimated: Burmese rubies are considered to have the best colour and are often referred to as Pigeons Blood.
At the time, it was reported the ruby alone cost Prince Andrew £25,000. Today the whole ring could be worth between £150,000 – £200,000 and given the fineness of the ruby, possibly a lot more!
Papas adds: After Charles and Dianas wedding, the Queen received just over an ounce further of the rare Clogau gold so that future wedding rings could be made for the Royal family. The Duchess of Yorks wedding band was therefore made from this gold and carries the same value.
Following their wedding, the Duke and Duchess Of York headed on honeymoon in an open carriage, complete with a paper mache satellite dish and sign that read Phone Home, as well as a giant teddy bear, all placed there by Diana, Edward and Viscount Linley, Princess Margarets son.
They boarded a royal jet – with the back door emblazoned with the words just married – and flew to Azores where they enjoyed a five-day cruise around the Atlantic on the Royal Yacht Britannia.
Some of the islands they visited they could only enter access via a rubber dinghy.