It's official: Lindsay Lohan has checked back into rehab. TMZ spotted the star being driven to Promises in Malibu by her lawyer yesterday.

Sources say Lohan will be a resident at the treatment facility for thirty days in "a serious medical treatment program," and that she will continue her treatment on an outpatient basis once the month is up. Lohan's next film, which was scheduled to begin filming later this week, will likely be put on hold.

I have to see it to believe it! Lindsay needs to seriously clean it up this time or make sure she only gets wasted at home.