Kylie Minogue battles to maintain her energy

She told the new issue of Grazia: "Some days I feel like I can do it all and then, on others, it feels like doing Pilates on a wobble board in midair and I'm wrecked.

"One of the guys I work with a lot says, 'You're like an amusement park - some days the rides are just shut; and other days it is like, "Whee! Everything's open, the bells are going and the big dipper is on"'.

"There are certain moments where I think, 'Oh, God, how to keep it up? But for the most part it's giving energy to create energy. I just have to colour the hair more often!"

When asked if the mental toll of fame has ever got to her, Kylie added: "I remember many, many years ago, I was really getting it from the Press and I just couldn't understand how it was possible to be so untrue or so mean.

"There was no name behind the article or the untruth, so there was no way of responding."

Kylie, who beat breast cancer in 2006 after being diagnosed with the disease a year earlier, also said she is glad the issue of mental health is now at the forefront of people's discussions like never before.

She went on: "I am happy that mental health is a conversation for everyone, including those within my industry.

"People generally understand that there are highs and lows of performing and putting yourself out there, but it is obviously much more complex and nuanced than that and, of course, different for every individual.

"Has it ever got too much for me that I've had to walk away? No. But it has definitely challenged me at times."