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6 year oldThe website reports that sources say Demi, 25, was taken to hospital from her Hollywood Hills home and she is currently being treated.
It is unclear what her condition is. The Sun Online has contacted her rep for comment.
The Camp Rock actress, who has battled with substance abuse from a number of years, was seen on stage just two days ago at the California Mid-State Fair.
She recently released a song called Sober in which she confirmed she had broken her six years sobriety.
In the track she sings: "Mama, I'm so sorry I'm not sober anymore/ And daddy please forgive me for the drinks spilled on the floor/ And I'm sorry for the fans I lost who watched me fall again/ I wanna be a role model, but I'm only human."
To mark the release of the song she had the word "free" written on her little finger.
Demi has been very open about her battles with addiction and emotionally celebrated her six year milestone during a concert in March.
Last year the former Disney star revealed she feared she had overdosed on drugs when she relapsed during her stint in rehab.
The checked into a rehabilitation centre in 2010 to help her overcome her battle with substance abuse.
But she later admitted she wasn’t “ready to get sober”, which saw her smuggle drugs around with her.
Speaking openly about her struggle on her new documentary titled ‘Simply Complicated’, the ‘Heart Attack’ artist said: “I wasn't working my program, I wasn't ready to get sober. I was sneaking [cocaine] on planes, I was sneaking it in bathrooms, sneaking it throughout the night … I went on a bender of like, two months where I was using daily."
And the star has revealed there even came a point where she feared for her life after she took a "bunch" of cocaine.
She explained: "There was one night when I used a bunch of coke and I popped a few Xanax bars, and I began to choke a little bit. My heart started racing, and I thought to myself, ‘Oh my God, I might be overdosing right now’.”
The Sorry Not Sorry hitmaker has admitted she was still taking drugs when she had a “sober companion” and would “fake” her tests.
She continued: “I was using while I had a sober companion. And I went through about 20 different sober companions.
“I would sneak out and get drugs, I would fake my drug tests with other people's pee.”
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