The Mean Girls actress was jailed last month (Jul10) for breaching her probation stemming from a 2007 DUI arrest.
Upon her release, after just 13 days, she was ordered to spend 90 days in rehab at the UCLA Medical Center in Los Angeles.
But Lohan was discharged from the facility on Tuesday (24Aug10) and will now receive outpatient care, according to TMZ.com.
Doctors at the centre reportedly told Judge Elden Fox, who is overseeing her case, that the star should be released from the hospital before the 90-day stint was completed.
A court hearing is scheduled to take place on Wednesday (25Aug10), but Lohan is not expected to be there.