The 20-year-old 'X Factor USA' judge, who spent time in rehab for an eating disorder, self-harm and emotional issues in late 2010, took to Twitter following 15-year-old Paris' alleged suicide attempt, reported Us magazine.
"Dear Paris Jackson, don't let bullies to let you down. We believe in you. Stay strong, Please," she tweeted.
Lovato previously said she signed a 'no suicide contract' after going through some tough times when she first found fame at the age of seven.
"The principal called my parents and made me sign this suicide contract saying that I would not kill myself. They weren't expecting that so young," Lovato said.