Ally McBeal: Had a host of guest stars

Sir Elton was reported to be in talks to appear in a number of episodes, although it has also been suggested that he may follow Sting's example and make a guest appearance in just one episode.

A spokeswoman for the show told BBC News Online: "Elton John will be performing a series of songs in the show and is appearing as himself."

Rock star Jon Bon Jovi is reported to be in talks to appear in the series also.

Sir Elton was said to have been persuaded by Robert Downey Jr, who appeared in the show and stars in the video for Sir Elton's new single, I Want Love.

Drugs charges

It is not yet known what songs Sir Elton will sing.

Downey Jr, who played the love interest of Calista Flockhart's lead character, was written out of the series earlier this year following an arrest on drugs charges.

Jon Bon Jovi is reportedly being lined-up to make a number of appearances in the award-winning series although the show's spokeswoman could not confirm this.

Jon Bon Jovi has starred in several films

Bon Jovi, who has recently turned his attentions from singing to acting, has appeared in films including U-571 and Pay It Forward.

Downey Jr had played opposite Flockhart since leaving jail in 2000.

He had served one year of a three-year term for drug offences and breaching court rules.

But he left the show after being arrested for drug possession in April.

Dramas

Earlier this year, former Police frontman Sting played himself in one episode.

In it, the star was sued by a man whose wife was infatuated with him.

The show follows the professional and personal dramas of neurotic lawyer McBeal, played by Flockhart.

Flockhart is nominated for Best Comedy Actress in this year's Emmy Awards, which have been postponed until October.