Lindsay Lohan's fellow Lynwood Correctional Facility inmates give Mean Girls a whole new meaning. Most of the women housed near LiLo are killers.

As in people actually doing time for murder.

Lohan expressed fears of being housed with these inmates since being thrown in jail two days ago, but has not received any special treatment yet.

She did enjoy some slightly less reprehensible company yesterday, though, when she was paid a visit by her mother, Dina, and her little sister Ali.

"Tears were shed," a source close to the family said. "The visit was very emotional, but Lindsay's spirits were lifted, seeing her mom and sister."

As for Michael Lohan? He may join her in prison.

SPRUNG: If Lindsay behaves, like she has so far, she'll be out quickly.

Visiting hours at the jail are typically limited to weekends, but in this case, the troubled actress was allowed an exception - for security reasons.

"Lindsay might receive visitors after official visiting hours are over for security reasons," a jail official said. "It's for the safety of everyone."

Meanwhile, Lohan has been serving out her 90-day sentence - which is expected to be reduced to just 14 days due to overcrowding - in peace.

She's "cool, calm and sleeping a lot," says a source. "She's not a mess at all. She's keeping to herself ... and really handling it pretty good."

She may not have to handle it much longer, either. Says her attorney:

“It's our expectation that Ms. Lohan will get additional time credit from her earlier times in custody and that would reduce her time in jail."

Lindsay was expected to be released on August 1, or after two weeks, but according to Shawn Chapman Holley, she may be sprung sooner.

Judge Marsha Revel will decide how much time credit Lohan will receive and then send a minute order over to the L.A. Sheriff's Department.