Coldplay frontman Chris Martin said: 'We're all big X Factor fans so we're very excited to play live on the show.'
Meanwhile, 2006 winner Leona previously revealed that she would perform.
One Direction and JLS, who feature on the X Factor charity single, will also take to the stage.
Judge Gary Barlow added: 'This is the biggest final The X Factor has ever done. Being at Wembley Arena for the first time and in front of 10,000 people with Coldplay performing, I can't wait - it's going be an amazing night.'
It has not yet known if any of the performers will duet with the X Factor finalists.
This year's live finals will take place on December 10 and 11.