The Los Angeles Fire Department received a medical call from a home along Laurel View Drive in Hollywood Hills on Tuesday shortly before 11:30 a.m.
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Fire officials confirmed that a 25-year-old woman was transported to a local hospital. Police and fire officials have yet to confirm the identity of that woman.
But multiple sources told ABC News that Lovato is being treated at Cedars-Sinai Medical Center. Her condition is unknown.
"Demi is awake and with her family who want to express thanks to everyone for the love, prayers and support," Lovato's representative said in a statement Tuesday evening. "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."
Lovato has been outspoken about her battles with bipolar disorder and substance abuse.
In March, the singer retweeted a post of an interview she gave, during which she said she was six years sober.
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In May, she tweeted that new music and lyrics would reveal the truth.
Just last month, Lovato released a new song called "Sober," which includes lyrics indicating she was not sober anymore.
According to Lovato's website, upcoming tour dates have been rescheduled. The singer's publicists have not responded to Eyewitness News' requests for comment.
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Fellow musicians and celebrities, including Ariana Grande, Brad Paisley and Ellen DeGeneres began taking to Twitter, showing an outpouring of support for Lovato.