JLS, who finished second on the 2008 series, will return on Sunday (October 21) to perform their new single 'Hottest Girl in the World'.
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The band mentored the acts at this year's Boot Camp and collaborated with One Direction and the X Factor finalists of 2011 on charity track 'Wishing on a Star'.
Labrinth, meanwhile, is expected to play 'Beneath Your Beautiful', on which Sandé is a featured artist.
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© WENN.com
It was announced on last Sunday's Xtra Factor that the remaining 11 contestants will be tackling 'Club Classics' this week.
The previous series had a similar 'Dancefloor Fillers' theme, which saw eventual winners Little Mix perform Rihanna's 'Don't Stop the Music' and runner-up Marcus Collins cover 'Reet Petite'.
It was reported this week that Beyoncé has been approached to duet with Ella Henderson should she make it to the X Factor final.
The X Factor continues Saturday (October 20) at 8.20pm on ITV1.
Digital Spy breakfast show - watch Anna Williamson discuss the day's biggest stories including Girls Aloud, X Factor and The Great British Bake Off:
