UPDATE: A source is telling People Magazine that Demi is now "stable."

photo via Demi Lovato Instagram

25-year-old pop singer Demo Lovato has been hospitalized after suffering "what appears to be a heroin overdose," according to reports from TMZ. "Our sources say Demi was transported from a home in the Hollywood Hills just before noon Tuesday, and is currently being treated. We do not know her condition," the article reads.

TMZ posted an update not long after the original post, which reads: "Law enforcement sources tell us Demi was treated with Narcan -- an emergency treatment for narcotic overdoses -- at her home. We've confirmed the OD occurred at her house in the Hollywood Hills."

UPDATE 2: TMZ says sources now tell them Demi had not taken heroin. A representative for Demi gave a statement, which reads: "Demi is awake and with her family who want to express thanks to everytone for the love, prayers and support. 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."

As TMZ's article also points out, Demi has been open about addiction and substance abuse in the past, and she recently released the song "Sober," which revealed that she had broken her period of sobriety.

This story is still developing.