Demi Lovato is a natural beauty. The 'X Factor' judge / 'Heart Attack' singer took to Twitter to post a makeup-free photo and encouraged her beloved Lovatics to do the same in a concerted effort to boost their self-esteem -- and based on the reactions she garnered, it worked!

Proof that Demz not only cleans up nicely, but she cleans off nicely too. What a class act!

Watch the Demi Lovato 'Heart Attack' Lyric Video