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Kathy Griffin reignited feud with Demi Lovato after she slammed the singer's 2015 MTV Video Music Award performance. In a tweet she posted on Monday, August 31, the comedian accused the former Disney star of lip-syncing her new single "Cool for the Summer" at the Sunday, August 30 event.

"Demis live singing was very obviously live if you know I'm saying. And then the rest of the track or tracks. #atleastshesang-ish," she wrote. Lovato eventually found the tweet and responded to the allegation by insinuating that the former "Fashion Police" host was obsessed with her.

Happy 2 see ur still stanning me @kathygriffin. Dont worry, my new album is out Oct 16. But u prob already knew that. pic.twitter.com/6A3tr3nNxv

— Demi Lovato (@ddlovato) August 31, 2015

"Happy 2 see ur still stanning me @kathygriffin. Dont worry, my new album is out Oct 16. But u prob already knew that," she said on her on Twitter page. Griffin then shared a throwback photo of her and Lovato together, and made fun of the singer's use of slang in the caption, saying, "I was STANDING next 2u when I received my #dosomething award."

I was STANDING next 2u when I received my #dosomething award����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½���¯���¿���½����¯�¿�½������°����¯�¿�½���¯���¿���½����¯�¿�½������¯����¯�¿�½���¯���¿���½����¯�¿�½������¿����¯�¿�½���¯���¿���½����¯�¿�½������½����¯�¿�½���¯���¿���½����¯�¿�½������¯����¯�¿�½���¯���¿���½����¯�¿�½������¿����¯�¿�½���¯���¿���½����¯�¿�½������½����¯�¿�½���¯���¿���½����¯�¿�½������¯����¯�¿�½���¯���¿���½����¯�¿�½������¿����¯�¿�½���¯���¿���½����¯�¿�½������½ RT @ddlovato: Happy 2 see ur still stanning me #KATHY pic.twitter.com/K7z0zt5Jgs

— Kathy Griffin (@kathygriffin) August 31, 2015

Griffin and Lovato had a spat last year after the comedienne called the "Heart Attack" hitmaker the "biggest douche celebrity" she's ever met. Griffin received multiple death threats from Lovatics out there following her comment.