James Arthur has became embroiled in a Twitter spat with comedian Frankie Boyle.
Frankie, 40, sparked the war of words when he told his followers: "James Arthur is like a cross between a tramp and a duckling."
X Factor finalist James, 24, retaliated: "Poor old man making yet more s*** jokes about X Factor because he knows that's the only way he can get attention any more."
The former Mock The Week panellist continued his jibes, writing: "I think if I wanted attention I'd sing covers on a talent show, inked up like a school desk in a remedial class."
James returned with: "You're about as funny as Aids. You're a sad man and I can't wait to see you coz it's about time someone gave you a reality check.
"Have you seen the state of you? How can you make remarks about the way I look?
"Stop using my name to try to rekindle your career and making jokes about people on TV shows is one thing but you make jokes about people with disabilities, which is a disgrace."
Frankie, who in the past made jokes about Katie Price's disabled son Harvey, then branded James "a sheep's teeth in a baby's head", adding: "Get a sense of humour you pompous alien-headed busker."