The couple have been in a civil partnership since 2005, and were among the first same-sex couples to have a civil ceremony in the UK, but since the legalisation of gay marriage in England and Wales this weekend, the pair have decided to take their relationship to the next level.
David told the Las Vegas Review-Journal: "Since we’re committed for life, we feel it's really important to take that step, and take advantage of that amazing change in legislation. We all live by example."
He explained the May ceremony will be a small affair at a registry office, attended by the couple's 2 children.
David also praised the recent change in legislation in the UK, and the progress that had been made in the past 2 decades for LGBT people in Britain, saying: "We’re living in extraordinary times. My god, 20 years ago, when I started seeing Elton, if you asked me if I'd be able to get married, if I'd be able to have children, it was unthinkable, literally unimaginable."
The couple first announced that they had made the decision to get married over the weekend at Elton's 67th birthday party in Las Vegas.
We're already picking out a hat, and wondering what to get the happy couple as a wedding present.
Let's just hope our invitation doesn't get lost in the post.
Elton and David have two children together - 3-year-old Zachary and 1-year-old Elijah - whose godmother is popstar Lady Gaga.