Simon Cowell said to be furious with Dannii Minogue's attitude

Simon Cowell is said to be furious with Dannii Minogue's behaviour on The X Factor.

The judges were good pals last year, but is seems this year everything has changed.

Simon's ex-girlfriend Sinitta reckons their friendship is at breaking point.

'Things are getting really bad between Simon and Dannii. He's continually taking swipes at her,’ she says.

'He doesn't like the fact that she's come into this series all cocky from winning it last year, saying: "I'm going to win it again."

'And she's been criticising him on live TV, which isn't a good idea.'

Sinitta, 40, even thinks Simon, 49, is deliberately forgetting the names of her acts.

'Last year it was all about Simon caring for Dannii and protecting her from Sharon Osbourne, but this year he hardly notices she exists and it's annoying her,' she tells the Daily Mail.

'Simon is forgetting the name of Dannii's acts on purpose to undermine her. I wouldn't be surprised if he pretends to forget her name this week!’

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