More personal photos of DEMI LOVATO have hit the Internet.  In some, she's in bed with then-boyfriend WILMER VALDERRAMA.  In others, she's naked.  Demi Tweeted a picture of herself in boxing gloves, along with a Spanish phrase that means, quote, "I am strong.  I am a fighter.  Do not underestimate me."

Demi is obviously meeting this head-on.  She Tweeted a picture of herself where she appears to be in boxing gloves, along with the caption, quote, "Soy fuerte.  Soy luchadora.  Asi que no me subestimen."

SEE THE PHOTOS HERE