Demi rose to fame on Disney Channel, starring in original movies Camp Rock and its sequel alongside the Jonas Brothers, before landing her own show, Sonny With A Chance.
Lovato's friends and fans have taken to their social networking sites to wish her well after the heartbreaking news of her overdose came to light on Tuesday. Instead of Lovato's headlining performance, it will feature the previously-scheduled opener Lauv, a NY singer-songwriter best known for his hit "Like Me Better", and DJ trio Cheat Codes who have been added to the bill.
Demi was rushed to hospital after suffering an apparent overdose, but it has since been confirmed the singer is now "awake and responsive".
"I'm praying for her", he added.
"Like all of you, I am thinking of Demi Lovato right now".
The 25-year-old singer is reported to be in a stable condition in hospital in Los Angeles following a suspected drug overdose. With her mother by her side, Lovato appeared on "GMA" earlier this year and opened up about six years of sobriety. "It's embarrasing to look back at the person I was".
"I had always been an anxious child and had suffered with different forms of anxiety, but in that time (after losing a relative) it was the worst it had ever been", she tells Newsbeat.
Demi seemingly continued the party at her Hollywood Hills home, where her overdose took place. "I remember sitting with my manager and my family and talking to them about whether or not to speak out about the issues that I was dealing with", she said.
The singer had recently released "Sober", which lyrics reveal she had fallen off the wagon. "I wanna be a role model/ But I'm only human".
She started partying in a bid to fit in with her peers, and says that drinking escalated to drugs.
Lovato's hospitalization made me think of Amy Winehouse and, as a result, the book Trainwreck, by Sandy Doyle.
"I can't imagine what Demi is going through right now".