Princess Diana was killed ten years ago when the Mercedes car she was traveling in crashed in the Pont de l'Alma tunnel in Paris. Her boyfriend Dodi Fayed and driver Henry Paul, who was drunk, also died in the accident.

The service which has been organized by her two sons, 25-year-old Prince William and 22-year-old Prince Harry, will be attended by around 500 people, including Queen Elizabeth II, Prince Charles, Diana's sister Lady Sarah McCorquodale and brother Earl Spencer.

Current British Prime Minister Gordon Brown and former PM Tony Blair, who called her the "People's Princess," will also attend.

Her death sparked a wave of public grief in the U.K. and round the world, and tributes and services are planned across Britain.

In Paris at the place where she died, hundreds of people of all ages and nationalities have gathered to show their respects for one of the most popular women of her time.

Prince Charles' wife, the Duchess of Cornwall, who was invited by Diana's sons, will not attend the service. In a statement issued by the duchess she said attending "could divert attention from the purpose of the occasion."