But on Saturday night, the star was seen out and about as she ate sushi in a Beverly Hills restaurant alongside designer Henri Alexander Levy.
According to a source cited by the publication, "Demi looked great and so happy to be out".
On Nov. 3, Twitter users said they spotted Lovato at Universal Studios' event Halloween Horror Nights.
Revelan la causa de muerte de Mac Miller
Los paramédicos llegaron poco después y Miller fue declarado muerto a los 16 minutos de la llamada inicial al 911. En el tema la cantante llama a "Malcolm" un "ángel" y dice que desearía poder darle las gracias.
She was hospitalized for 10 days after her health scare on 24 July, and then checked into a facility on America's East Coast in a bid to get clean.
"Yes, she has 90 days and I couldn't be more thankful or more proud of her because addiction being a disease, it's work", she said October 27.
Her mother, Dianna De La Garza, gave an interview last week, assuring fans that Lovato is now 90 days sober. "It is something I must continue to overcome and have not done yet", she wrote in August. "She seems to be doing well so far", a source told People.
Demi's visit to LA comes after it was reported that she is considering not returning to the Southern California city permanently.