Los Angeles Superior Court Judge Elden S. Fox ordered Lohan to remain at the Betty Ford Center until Jan. 3 and report back to court in late February.
"You are an addict, I hope you understand that," Fox told Lohan.
A prosecutor had advocated a six-month jail sentence for the "Mean Girls" star, but Fox opted for rehab after reviewing filings by probation and rehab officials and a letter written by Lohan. The actress cried after hearing the sentence.
The judge acknowledged that Lohan, 24, has been in-and-out of court and rehab since a pair of high-profile arrests in 2007.
He told the actress that he would not be manipulated by her, but was giving her a final chance to stay clean. "You're staying past the New Year's — there's a reason for that," Fox said.
Fox's sentence means Lohan will not be returning to a suburban Los Angeles women's jail for a fourth time. The judge had threatened to send Lohan to jail for 30 days for each drug test she skipped or failed.
He ordered her held for nearly a month during a hearing in September, but another judge overturned his ruling and Lohan has been free on bail and in inpatient rehab voluntarily since then.
Lohan is due back in court on February 25.
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