Demi Lovato Warns Miley Cyrus About Partying Ways: "Be Careful"

Lovato just wants the best for her friend, from her own experience. Back in 2010, the former Disney star checked herself into the Chicago area rehab center Timberline Knolls to treat emotional and physical issues, and was later released.

In the past, Lovato has also struggled with an eating disorder, which led to self-mutilation. “It was a way of expressing my own shame, of myself, on my own body," the young star told Good Morning America’s Robin Roberts back in 2011.

Since then, Lovato has been well on her way towards full recovery. Whenever she feels the urge to rebel, the singer/actress does it with her hair.

“I'm crazy with my hair, it's my only form of rebellion,” Lovato told MTV last year. “I don't drink, I don't do drugs, I don't party.”

She also wants the best for Miley.

“I care for her so much that I'm so protective, but she's good,” Lovato told MTV. “She's got a good head on her shoulders."