The 'Call My Name' singer has long been tipped to make an appearance on the new series of the show.
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 fates of fellow judges like Tulisa Contostavlos and Nicole Scherzinger are not yet known.
The 'Impossible' singer congratulates his fellow X Factor star on the reception of her first demo.
The former judge is said to have signed on for the 2013 series after months of speculation.