Jun 26, 2007, 12:10 GMT
Ricky Gervais and Mackenzie Crook will duet at the Concert for Diana in London this Sunday (01.07.07) before introducing Sir Elton John on stage.
The pair will recreate a classic singing scene from their hit comedy 'The Office' at the event, which is being held on what would have been Diana's 46th birthday to mark the ten year anniversary of her death.
A source said: "Although the show coincides with Diana's birthday, her sons, Princes William and Harry, want it to be a day of remembrance and celebration, not mourning.
"They're both huge fans of 'The Office' and were thrilled when Ricky and Mackenzie agreed to do something."
The duo will perform the song 'Free Love on The Freelove Highgway', originally performed by their characters David Brent and Gareth Keenan on the show.
The concert at the new Wembley Stadium features an all star line-up including Take That, Lily Allen, Kanye West, Nelly Furtado, Joss Stone, Duran Duran and Kylie Minogue.
William said: "We wanted to have this big concert, full of energy, full of the sort of fun and happiness which I know she would have wanted. And on her birthday as well, it's got to be the best birthday present she ever had."
(C) BANG Media International
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