Demi Lovato Former Bulimic and Substance Abuse Addict Insight on "Live a Healthy Life" and "Take Care of Yourself" Motto [VIDEO]

Recovering from an eating disorder and substance abuse addiction, pop star Demi Lovato hasn't let that stop her from being the face of Skechers and keeping up with her healthy lifestyle choices.

"I think it's extremely important to take care of yourself and live a healthy lifestyle, because it affects your mental well-being as well," she told PEOPLE about keeping in shape during her tours. "Every performance on stage for my world tour is a workout, so I've been doing a lot of cardio to keep my stamina up and put on a great show for my fans."

The girlfriend of Wilmer Valderama had experienced depression, an eating disorder and self-harm issues way before her rehab stint in 2010. She ultimately entered the Timberline Knolls inpatient treatment facility, where she acknowledged that she had been "self medicating" with drugs and alcohol and even sneaking cocaine onto planes.

But now she is on a roll, healthy and seemingly happy. "It's all about being confident and letting that radiate," she told PEOPLE. If she had to choose between singing and acting, she chooses singing. "There is no better feeling than performing for a live audience and feeling the energy I feel when I'm able to connect with my fans."