On the second series of The X Factor, during the filming of the final judges' auditions session in December 2014, whilst giving feedback to busker Sally Faherty who sang Frank Ocean's "Thinking About You". Natalia Kills started off by accusing Faherty of having wallflower body language. Kills then said "buskers often end up performing more to themselves than to the people around them because they go unappreciated for so long it's as if the people around them think that they are invisible. You have the body language as you're trying to blend into the background behind you. " The audience didn't appreciate what Kills had said and started booing her. Kills then said that Faherty was not invisible on the stage and that it was her time to change that. Judges Melanie Blatt and Stan Walker gave Faherty a "Yes", whilst Willy Moon (Husband of Natalia Kills) gave Faherty a "No". The pressure was on Natalia Kills (Moon's wife) to make the final decision. The crowd got involved trying to persuade Kills to put Faherty through. Kills then snapped at the audience saying "Stop, stop it right now, you're going to fuck this for her". Despite her comments, Kills decided to put Faherty through to Bootcamp by giving her a "Yes". Some members of the audience (including children) were shocked at the outburst and walked out. A TV3 spokeswoman said both the network and Kills apologised for the incident. The incident was featured in the final audition episode, with the profanity bleeped out. Faherty was also heard using the F word backstage which was bleeped out.
As already previously announced former host Dermot O'Leary will return for presenting duty after being temporarily replaced by Olly Murs and Caroline Flack last year.