The singer, who is now working for Cowell again on the Australian version of 'The X Factor', told The Sun: “I don’t think he knows where Australia is.
“He has that whole thing where he hates flying — and there’s the smoking thing. That’s why he has to go on a private jet, so he can smoke.
“He’s like, ‘I can’t get a private jet to Australia but I can’t do the no-smoking thing either’. ”
Kylie's sister, who first worked with Cowell on the UK 'X Factor' from 2007 to 2010, also spoke out about their supposed affair which was revealed in a kiss-and-tell biography, said to have been written with Cowell’s co-operation.
Minogue hinted it may not have revealed the full truth, saying: “What the hell is there to say? Fact — or fiction? That’s all I’m saying. I don’t understand any of it. It’s his thing, his issue."
On Tuesday night, Dannii was out in New York with her sister at the launch of Kylie's new fashion book. They posed for a cute snap together:
Dannii is currently preparing to return to British TV - she is now looking for the X factor in girls on the catwalk on 'Britain and Ireland's Next Top Model'.
She will pick the fashion world's next darling alongside head judge Elle Macpherson and male judge Tyson Beckford.