Demi Lovato & Kathy Griffin Reignite Their Year-Old Feud With ALL This Shade During The MTV VMAs! Get The Deets HERE!
And much to no one's surprise, it didn't go over well!
If you don't remember, these two previously had a spat after the comedienne said the Cool For The Summer songstress was the "biggest douche celebrity" she had ever met.
So when Kathy decided to take to Twitter to call out her singing abilities during the show on Sunday, Demi didn't keep quiet!
Here's what happened:
[Image via WENN.]