Lindsay Lohan is set to begin serving a 90-day jail sentence on Tuesday and the troubled young actress will follow through, her new lawyer pledged on the weekend.

Noted attorney Robert Shapiro, best known as a member of the so-called legal "dream team" that represented O.J. Simpson, signed on late last week to represent Lohan.

The actress received the 90-day sentence on July 20 for violating the terms of her probation for drunk driving charges dating from 2007.

"I have agreed to represent Ms. Lohan on the condition she comply with the terms of probation, including a requirement of jail imposed by Judge Marsha Revel," Shapiro said in a statement issued Friday.

"Ms. Lohan is suffering from a disease that I am all too familiar with. Hopefully, I can be of assistance to Ms. Lohan and Judge Revel in implementing a treatment approach recommended by medical professionals for Ms. Lohan's long-term recovery and sobriety," the statement said.

Shapiro's son, Brent, died in 2005 after battling drug and alcohol addiction. After his son's death, the lawyer started a foundation to support those in need of addiction treatment and opened an in-patient, sober living facility called Pickford Lofts.