The boyband, who finished third in 2010, have made several appearances on this year's show following their global success.
Sandé also performed 'Beneath Your Beautiful' with Labrinth a few weeks back, and her songs, particularly 'Read All About It (Part III)', have featured prominently throughout the competition.
Union J, Jahmene Douglas, Christopher Maloney and James Arthur remain on The X Factor and will battle it out for a place in the December 8 final this weekend.
Dermot O'Leary will host this year's final in front of 12,000 fans at Manchester Central. More guest acts are expected to be announced soon.
Jane McDonald has expressed an interest in dueting with Maloney should he reach the final.
Meanwhile, Pink and and X Factor judge Tulisa Contostavlos will take to the stage on this Sunday's (December 2) semi-final results show.
Photo gallery - The X Factor ABBA and Motown results show: