The 'R.I.P.' star is said to be fully focused on the launch of her second album this year instead.
Created by music mogul Simon Cowell, The X-Factor is a music based talent show that sees thousands of hopefuls audition and then perform until just one act remains.
2004 - Steve Brookstein
2005 - Shayne Ward
2006 - Leona Lewis
2007 - Leon Jackson
2008 - Alexandra Burke
2009 - Joe McElderry
2010 - Matt Cardle
2011 - TBA
Other notable participants:
2008 - JLS (runners-up)
2009 - Olly Murs (runner-up), Stacey Solomon (third place)
2010 - Rebecca Ferguson (runner-up), One Direction (third place)
The 'Under The Sun' star is rumoured to be joined by Olly Murs on the panel.
The X Factor judge says the show and UK singer both "need" each other this year.
The 'Troublemaker' singer is said to be in talks with producers to sit on the 2014 panel.
As the N-Dubz star confirms her exit from the hit music reality series, we asked Capital listeners to vote on Facebook for who they would most like to see take to the judges seat for the 2013 series.