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While heading into her outpatient meeting in Studio City, Demi Lovato seemed to be in great spirits ... even giving X17 a wave!

In January, the 18-year-old Disney star completed her stay in rehab where she was being treated for "emotional and physical issues." The Sonny With A Chance actress checked into the facility late last year after an alleged fight with backup dancer Alex Welch.

In a recent online video, Lovato revealed that rehab was one of her "darkest times." She also said:

    "Your support is what got me through this. The journey has been very, very difficult the past few months. I was dealing with issues that I know not only girls just my age but of all ages are dealing with."


Read more of her message to fans ... after the jump.