Leona Lewis felt "uncomfortable" judging 'The X Factor'.
The 'Bleeding Love' singer stepped in as a guest judge during the auditions round of the ITV1 singing competition, and found it difficult that producers allowed cringe-worthy and unstable performers to be mocked in front of a large audience.
Leona said: "I was a judge on the show, and I would see some acts and I'd feel uncomfortable watching them. Like, oh, you're not supposed to be here - I'm not comfortable with this.
"[The producers] would say, 'No no its fine they want to be involved. It's all for fun'… but I feel like some of the acts that go on it may not be 100 percent stable and shouldn't be on there."
The 27-year-old star wowed the judges with her rendition of 'Over The Rainbow' when she tried out for the show's third series in 2006, but head judge Simon wasn't quite as impressed and said she'd fallen off the melody.
Leona has finally hit back, telling Time Out London: "I didn't fall off the melody, it was an Eva Cassidy version of the song, which clearly he hadn't heard before. I don't think that anyone's right 100 per cent of the time."