Demi Lovato had a very candid interview with Access Hollywood's Kit Hoover and spoke about her once serious addiction to drugs.

"I couldn't go without 30 minutes to an hour without cocaine and I would bring it on airplanes," she said from the set of The X Factor on Monday. "I would smuggle it basically and just wait until everyone in first class would go to sleep and I would do it right there. I'd sneak to the bathroom and I'd do it."

Demi Lovato Through The Years

The 21-year-old, who recently released her memoir "Staying Strong: 365 Days a Year," also explained that manipulation helped her fuel her addiction.

Celebrities Who Have Been To Rehab

"I'm very, very good at manipulating people and that was something that I did in my disease, I would manipulate everyone around me," she said. "There were times I would just continue to lie, so that everything looked OK on the outside."

During that time period, Demi was able to hide her addiction from her mother Dianne, as well as her "sober companion," who was with her every day.

At around 19 years old, Demi hit the point where she realized she had to change. The former Disney star, who also suffered from an eating disorder, voluntarily entered rehab in 2010.

"I had a moment where I was like, 'Oh my God... that is alcoholic behavior. [It's] no longer, I'm young and rebellious and out having fun, it was, wow, I'm one of those people," she said. "I gotta get my s*** together.'"

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Demi Lovato