“Heart Attack” singer Demi Lovato might look like she has her life in order now, but a few years ago she was consumed by addiction, the “X Factor” judge revealed during a telling interview with Access Hollywood. The 21-year-old pop star just released a memoir, “Staying Strong: 365 Days A Year,” and revealed shocking facts about herself.

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

The former Disney star even admitted to carrying drugs on planes; that’s how serious her addiction was. “Something I’ve never talked about before, but with my drug use I could hide it to where I would sneak drugs. I couldn’t go without 30 minutes to an hour without cocaine and I would bring it on airplanes,” she revealed. “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. That’s how difficult it got and that was even with somebody [with me], I had a sober companion, somebody who was watching me 24/7 and living with me [and] I was able to hide it from them as well.”

Lovato was just 19 when she hit her rock bottom. For her, it wasn’t the fact that she could not go more than an hour without snorting cocaine or that she was lying to everyone who cared about her. Rock bottom for the singer came when she was chugging vodka out of a Sprite bottle at 9 a.m.

“I was throwing up in the car and this was just to get on a plane to go back to LA to the sober living house that I was staying at … I had all the help in the world, but I didn’t want it,” she said. “When I hit that moment I was like, it’s no longer fun when you’re doing it alone. I’ve really never talked about this stuff before… I don’t know if I should be sharing this.

“I think at 19 years old, 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…I gotta get my s*** together,’” she added.

Follow me on Twitter @mariamzzarella