She spent seven months in rehab in 2013 and is currently clean from cocaine and alcohol.
She has sold an estimated 100 million records worldwide, making her one of the world's best-selling artists of all time.
Chloe told the Mail Online she first tried cocaine at the age of 22, and was soon spending £80-a-day on the drug - while drinking vodka to "self-medicate".
The troubled youngster was also taking prescription drug Xanax, experiencing blackouts, and going on three-day benders.
Putting people with eating disorders together is the worst thing you can do.
CHLOE Rose Lattanzi has grown up in the public eye as the daughter of Olivia Newton-John, but now she's making a name for herself in the showbiz world, as an aspiring singer.