Amy Graves/WireImage
Mike Fleeman
September 28, 2010 09:15 PM

Newly freed on bail following a relapse, Lindsay Lohan voluntarily has checked into a substance abuse rehab program, a source confirms to PEOPLE.

The actress, 24, who most recently spent 23 days in a live-in program at UCLA Medical Center, planned to “step up her treatment” and “do more” than previously expected, a source has said.

The name of the new program wasn’t immediately known, although it’s in Southern California, according to the source. She checked in late Monday.

Lohan was released from a Lynwood, Calif., jail Sept. 24 after winning an appeal to be granted bail following a failed drug test. She is now wearing an alcohol-detecting ankle bracelet.

Reporting by KEN LEE

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