Demi Lovato's older sister Dallas recently took to Instagram to slam trolls who mocked the singer's weight.
"Why are you making my sister's body the topic of your conversation? Go f**k yourself," she declared in an expletive-filled rant on Instagram.
"I'm sorry, but my sister's beautiful, she's alive, she's conquering a lot of really hard s**t. So bye."
Lovato recently posted a photo of herself at jiu-jitsu, which prompted some critics to speculate that she's gained weight since rehab.