Update: Sources tell People that Demi Lovato is "okay and stable" following an apparent narcotics overdose on Tuesday morning (July 24).
The pop star is receiving medical care after allegedly overdosing on heroin in her Hollywood Hills home, TMZ reports; they confirmed that the overdose took place in her residence, and that she was treated with Narcan, a medication administered for opioid emergencies. Her condition remains unknown.
Lovato has been public about her struggles with addiction and recently revealed to her fans that her sober journey had come to an end when she released the moving ballad "Sober." In the song, Lovato laments, "Momma, I'm so sorry, I'm not sober anymore. Daddy, please forgive me for the spilled drinks on the floor. The ones who never left me, we've been down this road before. I'm so sorry, I'm not sober anymore."