Spears to perform on The X Factor

US pop star Britney Spears will perform on The X Factor, a spokeswoman for the ITV show has confirmed.

"She will be appearing on the show as a special guest, but we're not confirming the date yet," she said.

The 26-year-old singer is planning another comeback as she prepares to release her new album in December.

Spice Girl Emma Bunton, Kimberley Walsh from Girls Aloud, former pop star Sinitta and Westlife's Shane Filan will appear as X Factor judge mentors.

Boot camp

Bunton has been called in to assist Dannii Minogue with her category.

Walsh will help new judge Cheryl Cole, Louis Walsh and Filan are to work together and Sinitta will advise Simon Cowell.

The ITV talent show will begin its "boot camp" stage on Saturday, where fans of the show will see the four judges continue to whittle down the acts for the live shows, which take place later this year.

It has not yet been announced which categories each judge will be taking care of.

The BBC's flagship Saturday night show, Strictly Come Dancing, will take on The X Factor this weekend, with both programmes overlapping for 20 minutes.

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