Louis Walsh has branded Frankie Cocozza an "arrogant, obnoxious little f***er."
The 61-year-old judge has hit out at the former 'X Factor' star - who shot to fame in 2011 - for his wild behaviour, intolerable personality and lack of singing ability.
He said: "Frankie Cocozza was an arrogant, obnoxious little f***er. He was all hair and no talent."
The silver fox has also slammed rapper Cher Lloyd - who finished fourth in 'The X Factor' UK in 2010 - for her diva attitude and has admitted he never really liked her, despite her going on to be a huge hit in the US.
He explained: "There's always one or two [acts from 'The X Factor I don't like]. I never liked Cher Lloyd. I saw the way she was behind the scenes, like a spoilt little child."
Meanwhile, Louis - who announced earlier this year he was leaving the show - believes Cheryl Cole will reclaim her seat on the judging panel after leaving in 2010 to join the US version of 'The X Factor'.
Speaking to NOW! magazine, he said: "Sometimes he [Simon Cowell] puts someone in the mix who won't work because he likes the aggro with the girls, like Dannii Minogue and Cheryl Cole - he loved all that. Maybe Dannii will come back!"