Taking place at London's Savoy Hotel, the event will be hosted by Xtra Factor presenter Caroline Flack.
The event will feature a champagne reception and a live auction of prizes such as a luxury holiday to Mauritius and VIP tickets to The X Factor live final.
County Tyrone singer Devlin said: "To be performing at this year's X Factor ChildLine Ball is such a privilege and I'm really looking forward to it. All children need to have someone they can turn to when times are tough, and money raised through events such as this helps ChildLine be there for vulnerable children and young people in need of advice and support."
2010 X Factor finalists Diva Fever said: "We have so much respect and admiration for all the ChildLine counsellors who volunteer their time to provide round-the-clock support to those in need and help protect vulnerable children and young people from abuse and neglect.
"We're delighted to be performing at what promises to be a wonderful event, raising vital funds for a very worthy cause."
The X Factor ChildLine Ball will take place on Thursday, October 18.