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Sir Elton John will sing Candle in the Wind at Princess Diana's memorial concert this summer.
The star will perform the reworked version for the first time since the princess' funeral in 1997, despite vowing to never play it in public again.
A source said: "It would be a very fitting end to a very special day."
Sir Elton - who was a close friend of Diana's - originally wrote the song in 1973 as a tribute to late Hollywood icon Marilyn Monroe. He changed the lyrics in honour of Diana following her tragic death in a Paris car crash in August 1997.
Rocket Man singer Elton, 60, will join a host of stars confirmed to take part in the Diana memorial concert, taking place at London's Wembley Stadium on July 1, which would have been the princess's 46th birthday.
Lily Allen, Duran Duran, Joss Stone and Rod Stewart are among acts set to perform at the five-hour event.
Diana's sons Princes William, 24, and Harry, 22, have been planning the concert since last year.
Tickets went on sale in December and sold out in 17 minutes. A second batch of tickets went on sale at the weekend and sold out in 20 minutes.
- BANG! SHOWBIZ