The wedding’s taking place at their home in Windsor.
Elton John set up this Instagram account two days ago, where he announced he and partner David Furnish wanted to "share the love".
The pair had a civil partnership ceremony back in 2005, but when gay marriage was legalised in the UK earlier this year they decided to tie the knot once more.
Fortunately for the pair, things stayed dry this morning.
With the legal formalities completed...
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