Los Angeles ? Lindsay Lohan has moved to a substance abuse facility and signed legal papers hiring celebrity lawyer Robert Shapiro to represent her as she prepares to head to jail for violating probation in a 2007 drug case.

Shapiro, a key figure on O.J. Simpson’s legal “dream team” in 1995, confirmed Lohan was staying at Pickford Lofts, a treatment center Shapiro founded after his son died of a drug overdose.

Shapiro told The Associated Press on Friday he had agreed to represent Lohan only if she does her jail time and complies with the terms of her probation.

He said he would help the actress get treatment to accomplish long-term recovery and sobriety.

“Ms. Lohan is suffering from a disease that I am all too familiar with,” said Shapiro, whose son Brent died in 2005. “Hopefully I can be of assistance.”

Lohan is scheduled to begin serving a 90-day sentence on Tuesday.

Shapiro has represented numerous celebrity clients.

In representing Lohan, Shapiro is replacing attorney Shawn Chapman Holley, another veteran of the Simpson trial in which the former football star was acquitted of the murders of his ex-wife Nicole and her friend Ronald Goldman.

Holley resigned after saying Lohan’s sentence was harsh and unfair.

Shapiro filed papers in court signed by Lohan substituting him as her counsel.

The 24-year-old actress was sentenced to 90 days in jail earlier this month after a judge determined she violated her probation by missing seven weekly alcohol education classes since December.

The judge also ordered Lohan to spend three months in rehab after serving her sentence and to continue to undergo random drug testing until her probation expires.

Lohan pleaded guilty in August 2007 to two misdemeanor counts of being under the influence of cocaine; no contest to two counts of driving with a blood-alcohol level above 0.08 percent; and one count of reckless driving. She was sentenced to three years probation.

The plea came after a pair of high-profile arrests earlier that year.

Lohan has spent 84 minutes in jail and performed mandatory service at the county morgue.