2013

DEMI LOVATO

After fighting with her backup dancer, then-18-year-old Lovato entered treatment for "emotional and physical issues" in November 2010, staying for three months. When she emerged healthy in January 2011, the singer revealed she'd battled bipolar disorder, anorexia, bulimia and cutting. "I feel like I am in control now where my whole life I wasn't in control," she told PEOPLE three months later.