Demi Lovato was rushed to a Los Angeles hospital from her Hollywood Hills home just before noon Tuesday and was administered an emergency treatment for narcotic overdose, according to reports from TMZ.

People magazine reports that Lovato is stable, according to a close source, and TMZ says that Lovato's aunt has posted that the former Disney star is awake and responsive.

Lovato was scheduled to perform in Atlantic City on Thursday, but a city official confirmed to the Inquirer and Daily News that Lovato would not be headlining.

The concert was Lovato's only East Coast date this season; Lauv — who was scheduled to open — wrote on Twitter, "f-, my heart goes out to @ddlovato right now."

Lauv will still play on Thursday, though.  In a tweet late Tuesday, concert organizers spelled out options for ticket holders for the concert.

Lovato was also scheduled to appear on Fox's Beat Shazam Tuesday night in a pre-taped episode. According to a Fox release, the episode had been pulled and was to be replaced with another new Season Two episode.

Following Lovato's hospitalization, celebrities offered kind words on Twitter.

The pop singer and her family have been open about their struggles with mental health and addiction in the past. She has been diagnosed with bipolar disorder and was previously hospitalized. In a 2015 interview with Elle, Lovato said, "I knew at a young age I had a problem," and in her recent YouTube documentary Demi Lovato: Simply Complicated, she talked about her past addiction. "I just came to a breaking point; the next 12 months were extremely difficult," she said about her decision to seek treatment.

Lovato's latest personal address of her substance abuse and health issues is in her song "Sober," where she reveals she has relapsed after six years. The song was released June 21. She tweeted a clip of the new music with the caption "My Truth."

On Saturday, Lovato tweeted her feelings about the song:

Staff writer Amy S. Rosenberg contributed to this article.