No one really knows WHY Demi Lovato and Miley Cyrus appear to have hostility towards each other, but after Miss Cyrus unfollowed Demi on Twitter, Demi (sub)tweeted this:
Hmm wonder what that's all about! Play nice ladies!
PHOTOS: DEMI + MILEY THROUGH THE YEARS
PHOTOS: DEMI LOVATO AT THE IZOD CENTER
PHOTOS: MILEY CYRUS AT Z100 JINGLE BALL
Photo Credit: Getty Images