Pop singer Jamelia has spoken out about X Factor contestant leona today, much to the dismay of her mentor, Simon Cowell.

Jamelia told Hit 40 UK: “Leona’s great, she’s has an amazing voice but she’s a bit Mariah Carey circa 1990. I don’t know how she will fit into the music industry.”

Simon Cowell, hit back saying: “I am getting very angry. Someone is trying to get at Leona through launching a dirty tricks campaign.”

He told The Sun: “It is completely unnecessary – Leona is a very talented girl and this is all very unfair.”