The 18-year-old Disney TV star entered a treatment facility last November to deal with "emotional and physical issues."
Lovato, who starred in "Sonny With a Chance," had to drop out of a tour with the Jonas Brothers and it was revealed that she had fought with a backup dancer.
In a cheery video released on Cambio.com on Monday, Lovato told fans she's back home.
Lovato says she was dealing with issues that teen girls face but didn't say what they were.
In the past, she has acknowledged cutting herself.
Lovato told fans they brought light in her life during her darkest hours and without them "I probably wouldn't be here today."
In the video, Lovato said she was ready to resume working.
However, a statement released by Disney on Monday said Lovato's management would let them know when she is ready to return.
While "Sonny" was on hiatus, Disney put the rest of the cast and crew to work on "So Random," the sketch comedy show within the "Sonny" series.
Those episodes will begin airing in the spring, Disney said.
