The veteran musician married his partner yesterday at their Windsor estate.
Elton took to social media to post updates about their “big day”, including a photo on Instagram of himself, pen in hand, sitting next to Furnish at a desk, with a piece of paper in front of them, and the caption: “That’s the legal bit done. Now on to the ceremony! #ShareTheLove @DavidFurnish”
He used Twitter to direct people to the couple’s Instagram accounts where he said they would be sharing “special moments” from their wedding.
The Tiny Dancer singer posted snaps on the photo-sharing website, including an image of a wedding invitation emblazoned with red roses.
Yesterday morning, he posted a photograph taken at a window showing a garden, and wrote: “Good morning! Nice day for a wedding. #ShareTheLove”
The star posted a photograph of two pairs of shoes sitting at a fire, and wrote: “Our little ring bearers are fast asleep and their shoes are polished and ready for tomorrow’s celebration. @DavidFurnish #ShareTheLove”
The famous couple have two sons of toddler age called Zachary and Elijah.
On December 21 2005, they tied the knot in a civil partnership ceremony at the Windsor Guildhall, and a galaxy of stars joined the celebrations that day, including Victoria Beckham, Helena Bonham Carter and Michael Caine.
That service took place in the same venue where the Prince of Wales and Duchess of Cornwall got married.
The pair first met in 1993 when a mutual friend invited British Canadian film-maker Furnish to dinner with the rock legend.
With Furnish by his side, Elton John has hosted star-studded bashes and raised huge sums for his Aids Foundation.
Gay marriages became possible in England and Wales for the first time in March.
British prime minister David Cameron hailed the introduction as a “historic day” as many leapt at the chance to tie the knot.