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Demi Lovato Vanity Fair -- Here's What I Look Like Naked

Demi Lovato just did better than a 'no make-up' photo shoot ... she went no clothes.

Lovato was doing a pictorial with Vanity Fair when she decided to strip down for a truly natural shoot.

Lovato has been very open about her bouts with eating disorders and body issues ... and is hoping she can send a message for "loving the skin you're in."