After Jamelia’s caustic remarks about X Factor finalist Leona Lewis, the X Factor judges have hit back.

Simon Cowell said sarcastically: “Jamelia’s been fantastic. She’s a one-hit wonder and she’s got all the advice.

“My advice to her would be to have a second hit then have an opinion.”

Cowell added: “What annoys me about that is that when you get the chance to be successful and then someone else has the chance to be successful you should show them a bit of support, not that it bothers me.”

Osbourne said at a press conference to mark the ITV show’s final week: “Can I just ask something? Who is Jamelia? This is all going over my head.” Walsh replied: “She’s had one hit.”

And he added: “There are much bigger stars than Jamelia.”