The Xtra Factor hosts Caroline Flack and Olly Murs revealed the news after Sophie Habibis's elimination last night.
Club Classics was a theme in last year's semi-final and featured covers of 'Only Girl In The World' by One Direction, 'Show Me Love' by Rebecca Ferguson and 'You've Got The Love' by Matt Cardle.
Gary Barlow claimed that he was "excited" by the theme last night, but his act Frankie Cocozza was less confident about the dance night.
"I'll give it my best... bust a move in there maybe," he said.
Former X Factor runners-up JLS will perform on next weekend's Sunday night Results Show.
> 'X Factor' Halloween results show - live blog
View pictures of last night's X Factor below: