Demi Lovato PISSED at Ariana Grande Over Benefit Concert Snub

Is there a beef sizzling between Demi Lovato and Ariana Grande?? Fans are starting to think that might be the case! Demi Lovato was among the many friends to send an outpouring of love and support Ariana’s way and to those affected by the Manchester tragedy, and last I knew the two were really great friends… so why wasn’t Demi asked to perform??