Elton John has been a close friend of the royal family for decades - and is privy to many of their well-kept secrets.
The pop icon, whose pre-recorded performance was projected onto Buckingham Palace at the Platinum Jubilee concert, is well-known to have shared a special friendship with the late Princess Diana.
He first met the royal at Prince Andrew's 21st birthday party held at Windsor Castle in 1981, shortly before her wedding to Prince Charles - and they hit it off immediately.
