Michael Jackson's 15-year-old daughter is in hospital after allegedly trying to commit suicide and Demi - who has a history of self harm and whose estranged father recently died - has reached out to try to help the troubled teen.
A source told Star magazine: "With Demi having just lost her dad, she feels a special bond with Paris. She told Paris about how she'd endured horrible bullying about her weight and her looks and even nasty comments about her estranged father. That struck a chord with Paris because of her own controversial father and like Demi, she's been dieting for years.
"There are so few people in Hollywood who show up during the tough times but Demi is the real deal."
Demi has also recently partnered with a mental health charity to honor her late father, working with Cast Recovery to start 'The Lovato Treatment Scholarship' to help those with mental illnesses and seeking treatment following her estranged father Patrick Lovato's death.
She said: "My dad suffered from mental illnesses ... He was suffering so bad that he couldn't function in society normally and he couldn't get the help that he needed. So, when he passed away, I thought myself, 'I wish there was something I could have done.' "