Aussie X Factor judge Kate Ceberano has claimed that the series was a sham.

The singer was shocked by the "unethical" and "evil" behaviour of the show's producers.

"Once I got on the show, and they started shifting the goal posts, it became absolutely frightening," she told the Herald Sun.

Ceberano explained that some scenes were re-shot to make the show more dramatic.

"That was completely unethical," she said. "You can't deliver bad news twice hoping for bigger tears the second time around. That's evil. It was humiliating to be a part of that show. I think most people felt sorry for me."