The singer has admitted she "wasn't well in the head" when she was taken off the US version of the show just weeks into the job.
Cheryl Cole is to return as an X Factor judge, Simon Cowell has confirmed.
The full extent of pop star Cheryl Cole's latest tattoo has been revealed in a new photo.
Kimberley Walsh will follow in the footsteps of her ex bandmate Cheryl Cole, as the star is set to write her autobiography.
The former Girls Aloud singer, who reached the final of Strictly Come Dancing last year losing out to Louis Smith, will release her book in the autumn.
Walsh said: "People have been asking me to tell my story for years but it never felt right while the band was still together."
Girls Aloud, formed through ITV series Popstars: The Rivals in 2002, announced they were splitting last month after a ten year anniversary reunion tour.
Cheryl Cole has thanked the fans who were not able to make, Girls Aloud's ten year celebration tour.
To the people that haven't been able to make it, for what ever reason, we feel your support regardless and have done for 10 yrs..
A tweet sent from the band's Twitter page announced that the girls had "come to an end" of their time together.
Cheryl Cole turned heads in a £3,240 Balmain black tuxedo jumpsuit at the Jingle Bell Ball in London.
The singer joined bands JLS, Little Mix and The Script at the annual event, presented by Capital FM at the O2 Arena.
Cheryl Cole - who was given her big break on TV talent show Popstars: The Rivals - will tell the X Factor hopefuls she can sympathise because she has been in their position.
The Girls Aloud star says: "I've been there and I have been here so I know how you are all feeling, I am just excited to see what you have got. [I] think it's going to be amazing and I wish you the best of luck from the bottom of my heart."
Other guest mentors include Tinie Tempah, who teams up with Tulisa Contostavlos, Ne-Yo who accompanies Nicole Scherzinger and Sharon Osbourne who is the sidekick to Louis Walsh.
Former X Factor judge Cheryl Cole will be back on the show tonight, almost two years after her departure.
Cole will return as a guest mentor, helping Gary Barlow put his acts from the older "overs" category through their paces during the judges' houses stage of the ITV1 talent show.
She bowed out from the UK X Factor after the 2010 series to take up a short-lived place on the panel for the US version of the show.