Sir Elton John, Robbie Williams and Westlife have signed up to coach the 'X Factor' contestants.
The show's three judges Simon Cowell, Louis Walsh and Sharon Osbourne have each struck a deal with one of the stars to work with their group of finalists.
Robbie will look after the 16 to 25-year-olds, who Simon is mentoring this year, music legend Elton is to coach the over 25s, Louis' category, and
Irish boy band Westlife - who are managed by Louis - will work with the groups, who are being looked by Sharon this series.
A source said: "Simon said he wanted this series to be the biggest and best yet. This is a massive coup."
Other artists due make appearances on the show over the coming months, include Take That, Mariah Carey and opera group Il Divo - who are managed by Simon.
(C) BANG Media International
