Demi Lovato likes Coke ... Diet Coke.

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The former Disney star, who recently completed treatment for cutting, an eating disorder and depression, was spotted out at The Grove in L.A. last night wearing an anti-drug t-shirt reading "The only Coke I do is Diet." Her friend was also wearing the same shirt.

Lovato just released her first single since treatment last week, with the young singer saying recording "Skyscraper" was "such an amazing experience for me. It was such an incredible and emotional process."

Check out more shots of Demi's night out above.