We knew she was overwhelmingly consumed with her horrible addictions...

But had no idea Demi Lovato's trouble with illegal drugs and alcohol ran so deep!

In a new candid interview, the 21-year-old singer is speaking out about her past substance abuse issues, confessing she used to manipulate people (including a sober companion) to believe every front and lie she threw at them. She shared:

“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."

And then Demi-corn dropped a maJOR coke bomb!

The former Disney starlet was so buried in her drug habits, she couldn't go an hour without doing cocaine!

Demz revealed how she would sneak it on airplanes and hide her issue by waiting until everyone fell asleep

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