DEMI Lovato is ‘very grateful to be alive’ after her horrifying drug ordeal and will enter rehab again, friends claim.

The former Disney star, 25, was found unconscious in her Hollywood hills mansion ... but it’s still unclear just what drug she took after initial reports incorrectly stated it was heroin.

A source told E! Lovato had been partying for at least 12 hours prior to her overdose.

“This was going on for a few weeks and the warning signs were there,” the source said, according to E!.

“This is obviously a huge wake-up call. Demi doesn’t want to die and she’s very grateful to be alive.

“She will be leaving the hospital and heading straight to rehab. Her family has been by her side supporting her and is getting her the help she needs.”

Meantime, Lovato’s friends have sent out messages of support and love following her overdose with her ex boyfriend, NCIS star Wilmer Valderrama said to be “utterly devastated”.

Ruby Rose, the Jonas brothers and Lady Gaga have all sent messages to the Cool for the Summer singer as questions stil remain over what drug she overdosed on.

Valderrama, who Lovato dated for six years, was said to be “shocked” by the news.

“He knew she was going through a tough time but he wasn’t prepared for this,” a source close to the couple told People.

“He saw her through so many ups and downs and was her rock through some of her darkest moments. To see her back in such a sad and vulnerable place is heartbreaking for him.”

“He has always cared deeply for her and they truly remained friends after they broke up,” the source continued. “Demi always hoped they would end up back together in the future. He’s the love of her life and vice versa.”

Lovato, who was hospitalised yesterday after suffering from an overdose, is currently in a stable condition. Sources told TMZ that heroin was not the drug she overdosed on.

The Blast reports unnamed sources as saying the incident report states that a nurse at the hospital told police Lovato was using some type of methamphetamine in the time leading up to her overdose.

“Demi is awake and with her family who want to express thanks to everyone for the love, prayers, and support,” Lovato’s rep said in a statement to Variety. “Some of the information being reported is incorrect and they respectfully ask for privacy and not speculation as her health and recovery is the most important thing right now.”

Ariana Grande, who also grew up as a child star, shared a message that her mother Joan Grande wrote - saying Lovato helped her son, Frankie Grande, overcome an addiction to alcohol and prescription pills.

Lovato’s BFF Iggy Azalea revealed in June that she knew about Lovato’s relapse.

“I had known about it, as a close friend,” the 28-year-old revealed. “So I had really wanted for her to be the one to tell people that.

“And I worried a lot, as her friend, that something was going to leak or somebody would somehow take that and use it negatively against her, or to make her seem like she’s got a secret.”

“It’s not my business to say to my friend, ‘You need to fess up’ … But as a friend, you worry and you’re like, ‘Oh, my God, my friend, she has this thing that people can use against her and I really want her to own it.’ And she did!’

There has been no public comment so far from former BFF and fellow Disney star Selena Gomez or on again-off again friend Taylor Swift.

Lovato has been open about her battles with substance abuse issues and eating disorders.

In March 2018, the star announced she was celebrating six years of sobriety. However, just four months later, she revealed that she had relapsed in a song called Sober.

Lyrics included: “I’m so sorry I’m not sober anymore” and “I promise I’ll get help/It wasn’t my intention/I’m sorry to myself.”

Lovato previously completed a stint in rehab at age 18 for drugs, self-harm and an eating disorder before recovering in 2012.

In 2017 doco Simply Complicated, Lovato spoke about experimenting with cocaine at 17 and that she “loved it” right away.

“My dad was an addict and an alcoholic,” Lovato said.

“Guess I always searched for what he found in drugs and alcohol because it fulfilled him and he chose that over a family.”