Demi Lovato is coming clean about just how bad things got during her drug abusing days. "With my drug use I could hide it to where I would sneak drugs. I couldn’t go 30 minutes to an hour without cocaine and I would bring it on airplanes," the 21-year-old tells Access Hollywood. "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"—even though she had a "sober companion" who was supposed to be "watching me 24/7," she says. Lovato's new memoir came out last month. Click for more from the interview, including Lovato's "rock bottom" moment, which happened at age 19.