Watch The X Factor (UK) season 13 episode 18 online for free. After a sensational set of performances for last night’s Diva Week live show, tonight sees the next heart-breaking elimination. In tonight’s show the tension in the studio is palpable as host, Dermot O’Leary, tells the remaining acts who is safe and who has scored the lowest number of votes. There will be a nail-biting sing-off before the next contestant leaves the competition. Tonight sees Grammy award-winning superstar John Legend performing his brand new single Love Me Now, and Canadian singer-songwriter Shawn Mendes performing his new single Mercy.