01/26/2012 at 01:00 PM EST
Demi Moore has not been spotted
since a health crisis in January sent her to the hospital
, but PEOPLE has confirmed that the actress is in treatment.
According to a source close to the situation, the actress is in a facility and not at home still in Los Angeles, as some have speculated.
On Saturday, E! News reported
that Moore, 49, checked into Cirque Lodge in Utah the week after her Jan. 23 hospitalization.
"She's on total lockdown and only talking to a small group of people," a source tells E!, adding that the actress is being treated for addiction and an eating disorder.
A 911 call from Jan. 23 revealed that Moore had smoked a substance "similar to incense" and that she was "convulsing," according to the female caller. Paramedics who responded assessed the actress, then took her to the hospital.
Moore, who underwent rehab for drug and alcohol abuse in the mid-'80s, has been going through a rough time lately.
In November, she split from her husband
, Ashton Kutcher
. But even before her split from Kutcher, friends were worried.
"Really, it was over the last year her friends saw a change," a source recently told PEOPLE. "She wasn't sleeping as well, didn't seem to be eating and looked really gaunt."
On Friday, Moore's youngest daughter Tallulah celebrated her 18th birthday
at dad Bruce Willis
's Beverly Hills home along with her sister, Rumer