Lindsay Lohan being Treated for Meth Addiction

That's all? What about the coke, the pills and the booze? Baby steps, I guess.

TMZ has learned Lindsay Lohan will be treated for addiction to methamphethamine and bipolar disorder during her court ordered 90 days in rehab.

According to a source familiar with Lindsay's case, methamphetamine and opiates are her "drugs of choice".

Methamphetamine -- also known as crystal meth or simply meth -- is a highly addictive stimulant and opiates, generally, have more of a downer effect.

Morningside Recovery -- the Orange County , CA rehab Lilo's scheduled to enter -- lists opiate and methamphetamine detoxification among its specialties. As TMZ first reported, sources say Morningside was not on the list of facilities recommended by court appointed psychiatrists.

We're told Lindsay will begin her rehab stint almost immediately after getting out of Lynwood Correctional Facility.

Jacked from TMZ