The 21-year-old actress, who battled drug addiction in the past, lost her father in June last year, reported E! online.
"It's a great feeling knowing how to balance things in life. Feeling stronger and better than ever," Demi wrote on Twitter.
"Happy Lovatic Day...I'm alive because of you all. Thank you...I love you all so much," she added.
Earlier, Lovato revealed that during the height of her addiction she would try to sneak cocaine onto planes as she found it impossible to go without the drug even for an hour.
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