Elton John weds after 21 years with partner

David Furnish (left) and Sir Elton John.

WINDSOR, United Kingdom - British pop legend Elton John married long-time partner David Furnish at their Windsor estate on Sunday, the ninth anniversary of their civil partnership, with the singer posting evidence on social media.

The 67-year-old singer posted a picture on photo-sharing website Instagram of himself and Furnish brandishing pens as they signed a form.

"That's the legal bit done. Now on to the ceremony!" said the caption.

The star-studded ceremony will take place at their Windsor home, near London, close to the castle beloved by Queen Elizabeth II.