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Last week, Demi Lovato shared this zombie-fied picture on her Instagram account, along with the caption, "Because you can never start celebrating Halloween too early....... #DemiWorldTour... You guys ready???"

Lovatics may have thought Demi was just getting into the Halloween spirit a little early this year ... and maybe she is ... but this was actually a teaser for an amazing and unexpected cover of Michael Jackson's "Thriller" at her "Demi Lovato: The World Tour" stop in Baltimore, Maryland! 

What a gal ghoul! Check it out below!