Amanda Bynes -- Home for the Holidays After Release from Treatment Center

Amanda Bynes has been sprung from the Malibu rehab facility where she'd been getting inpatient treatment for her mental illness.

As TMZ first reported ... Amanda's meds and counseling had stabilized her condition -- bipolar disorder and schizophrenia -- to the point where doctors felt she could be released to her mother's supervision.

According to the attorney for Amanda's mom -- the actress is now at her mother's house, and will still be receiving outpatient treatment.

Bynes had been at The Canyon treatment center since September ... following her stay at UCLA psych ward.

Amanda still has to deal with a DUI charge. As we told you, a judge has ruled her competent to stand trial ... though a plea bargain seems likely.