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.
More top news
Jurgen Klopp has branded himself 'The Normal One' in his first press conference as the new Liverpool manager
Jurgen Klopp has officially been unveiled as the new Liverpool FC manager this morning.
The complications British nurse Pauline Cafferkey is suffering could be due to the Ebola virus 'reactivating', an expert says.