Samaire Armstrong has entered an outpatient facility to deal with some personal issues, PEOPLE reports

Her rep said in a statement: "Samaire Armstrong decided to enter an outpatient facility to deal with some personal issues in a therapeutic atmosphere and is doing very well. She continues to work on her show and will be completing her treatment in a matter of weeks."

A source tells Us Armstrong, 26, will be absent from only one episode of Dirty, Sexy Money, on which she plays a character who is dealing with substance abuse issues.

"She stumbled a bit, but she's back on set," a source claims.