The X Factor (UK): Season 15, Episode 21

15 - 21: Live Show 7

Dermot O'Leary hosts the fourth week of live shows. The remaining 14 acts will be keen to impress judges Simon Cowell, Louis Tomlinson, Ayda Williams and Nile Rodgers - still filling in for the absent Robbie Williams - as well as the viewing public - and escape elimination in tomorrow night's results show.