Sir Elton John is expected to play his tribute song to Princess Diana - Candle in the Wind - at the concert being staged in her memory.

Princes William and Harry asked him to perform the piece at the Concert for Diana, at Wembley stadium on July 1, 2007. Lily Allen, Rod Stewart, Natasha Bedingfield and James Morrison are among the other stars taking part.

About 100 children will join the princes at Wembley on Saturday, where they will watch the final preparations. Poorly children supported by the charity WellChild - of which Harry is a patron - will be among the guests at the luncheon.

The party will take place at the Royal reception room at the new stadium in north-west London, and guests will get to watch one of the artists perform a sound check. Princes William and Harry will also meet back-room production staff, from sound engineers to the lighting crew.

More than 60,000 people are expected to watch the concert, which the princes are putting on in celebration of their mother's life, 10 years after she died in a car crash.

Sir Elton, 60, a friend of Diana's, provided one of the most moving moment at the Princess's funeral in 1997 when he sang a new version of his hit Candle in the Wind. After the performance he vowed never to play the song again but it is thought he will for Sunday's concert.

Harry, when asked by the BBC if the singer had helped with the planning of the event, replied: "He's helped massively just by saying yes, and obviously a personal request from us is to do 'Candle In The Wind' again. So hopefully he'll be playing that."

The princes have also said they will get up on stage at some point during the concert. Both BBC Radio 2 and BBC One will be broadcasting live from the event.

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