The 42-year-old Aussie singer said her little sister has always been prepared to give her constructive criticism over the years to help her perfect her performance.
She told more! 'Dannii is so honest, she's perfect for X-Factor.
'Before she was a judge on the show, she would come to my concerts and I always knew I was going to get a real opinion. Like she'd say, 'Dancers two and five were off.' She'd give me a list of things.'
And the All The Lovers star admitted that although she isn't too much of a diva, she can be demanding when it comes to her hair.
Asked if she had ever made members of her entourage call her 'Ms Minogue' she replied, 'Oh that's a no. I need to be more of a diva. I promise I've got my diva stripes in other areas. I've had every possible hairdo ever.'