The theme for this week is 'Number Ones', with any song that has topped the UK charts being fair game for acts to sing.
Earlier today saw the shock departure of Lucy Spraggan, after she voluntarily chose to leave after being deemed too ill to perform two weeks in a row.
Her fellow contestants tweeted their support for the singer-songwriter's decision earlier, as well as mentor Tulisa Constostavlos, who said she was sorry to see her leave as she now counts Spraggan "as a friend".
The remaining contestants will now attempt to battle it out for a place in the X Factor final at the Manchester Central in December.
Tonight's song list is as follows:
Rylan Clark: 'Hung Up/Gimme Gimme' (Madonna/ABBA)
Union J: 'Love Story' (Taylor Swift)
Kye Sones: 'You Get What You Give' (New Radicals)
James Arthur: 'Don't Speak' (No Doubt)
Ella Henderson: 'Firework' (Katy Perry)
District3: 'Dynamite' (Taio Cruz)
Jahmene Douglas: 'Listen' (Beyoncé Knowles)
Christopher Maloney - 'All By Myself' (Eric Carmen)
Photo gallery - Lucy Spraggan's X Factor journey in pictures: