The '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, encouraging her to "be strong".

She wrote: "Dear Paris Jackson, don't let bullies to let you down. We believe in you!! Stay strong, Please."

Demi previously admitted she signed a 'no suicide contract' after going through some tough times when she first found fame at the age of seven.

She said: "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."

Following the incident, Paris' grandmother, Katherine Jackson, insists her granddaughter was "physically fine".

She said in a statement: "Paris is physically fine and getting appropriate medical attention.

"Being a sensitive 15-year-old is difficult no matter who you are. It is especially difficult when you lose the person closest to you.

"Please respect her privacy and the family's privacy."