"My dad was an addict and an alcoholic", Lovato said.
"Our thoughts go out to Demi and her family".
Meanwhile, Lovato's reps tell ET in a statement that she is "awake and with family". "Your bravery is unbeatable", she said.
"Her friends and him are just hoping that she gets better and that she can be great and thrive", the source added.More news: Toronto police delving into life of gunman in mass shooting
Live Nation, the New Jersey Department of Community Affairs, Atlantic City and the Casino Reinvestment Development Authority are in talks to figure out what to do about Thursday's concert.
"Mama, I'm so sorry I'm not sober anymore".
"To the ones who never left me, we've been down the road before".
However, there's confusion over whether the overdose was heroin related. "She is a light in this world, and I am sending my love to her and her family". She went on to become a multi-platinum pop star, launching Top 10 hits like "Sorry Not Sorry", "Skyscraper", "Heart Attack".
She also hints in her song Sober that she recently relapsed, and has been candid about her struggles with mental health as well over the years. "My heart started racing, and I remember thinking, 'Oh my God, I might be overdosing right now".
After completing her treatment the following January, Lovato revealed she'd been using cocaine often and had also been diagnosed as bipolar. "I am so happy you're alive".