X Factor judge Sharon Osbourne has admitted that she found working with former colleague Dannii Minogue on the reality music show "deeply irritating".
The 60-year-old star explained that she struggled to work with the 41-year-old singer because of the relationship Minogue had with show mogul Simon Cowell on set.
In her autobiography, Unbreakable, Osbourne wrote: ''She [Dannii] clearly felt ******** Simon gave her vicarious power and it was so immature, not to mention deeply irritating to deal with.''
Osbourne claimed that Minogue's behaviour quickly became "unbearable", saying: ''The closer she got to Simon, the more I felt she started telling the producers what to do. Suddenly, from being the new girl, she was saying, 'This isn't right' and, 'Simon doesn't like it this way'."
She continued: ''For me, it made her so unbearable to work with that I just couldn't take it. It was horrible. My stomach was constantly knotted with anxiety about it and as each show loomed I would wake up and think, 'Oh God, I have to spend the day sitting alongside her again'."
Osbourne, who returned to The X Factor judging panel this year, said that she eventually turned to Cowell to ask him which female judge he wanted to keep, but he would not choose.
She said: ''I was here to fight my corner... I walked in, gave him a kiss on each cheek and launched straight in. 'I can't take it anymore. It's her or me,' I said."
Osbourne added: ''His expression remained impassive. Simon is used to spats between the women in his life and clearly takes it all in his stride. [He said] 'I'm not going to make that choice, Sharon. I'd like you both to stay'."