The superstar singer, 67, started an Instagram account especially to share the happy news with his new followers - and to update them on their special day.
On Saturday (20 December), he posted a picture of a wedding invite with the message: "Please join us this Sunday @DavidFurnish and I will be posting special moments from our big day. #ShareTheLove #EltonJohn #DavidFurnish."
The invite, with white capital letters on a background of red roses, said: "Sir Elton John and David Furnish request the pleasure of your company to celebrate their wedding on Sunday 21st December."
Fans responded with kind message of support.
One said: "Wonderful - thinking of you both and lovely family! Have a magical day xx."
Another wrote: "Fabulous - wishing you both all the very best for a wonderful day and a happy and healthy future life together xxx."
'Candle In The Wind' singer Elton, who has two adopted sons Zachary and Elijah with director David, also shared a cute photograph of two pairs of boys shoes.
He wrote: "Our little ring bearers are fast asleep, and their shoes are polished and ready for tomorrow's celebration. @DavidFurnish #ShareTheLove."
On the big day, we saw a picture of the long-term couple signing the documents to confirm they are now officially husband and husband!
Elton said: "That's the legal bit done. Now on to the ceremony! #ShareTheLove @DavidFurnish."
What a lovely way to announce a wedding!
Elton and David, 52, have been together for 21 years and exchanged vows for a civil partnership on 21 December 2005 - exactly nine years ago.
They married in their Windsor home, along with guests including Liz Hurley, David and Victoria Beckham and the Osbourne family.
Britain legalised same-sex marriage on 29 March 2014.
'N Sync's Lance Bass also married his partner Michael Turchin this weekend.
They got hitched at the Legendary Park Plaza Hotel in Los Angeles.
Before the romantic ceremony, Lance tweeted: "Today I marry the man of my dreams. He makes me smile; he makes my heart melt; he makes me.... me."
Pass us the tissues! SOB!
Are you happy to see Elton John and David Furnish tie the knot? Tell us in the comment box below and you could win £50!
Celebrity couples who have wed in 2014:
Copyright: WENN Twitter @realbkbrown / Instagram @norman cook / E! Instagram @kimkardashian / Rex FeaturesReveal is now on Google Plus! Join us here for the latest pictures, fashion and celebrity news!