Lindsay and Mom Party Before Deposition

5/4/2010 10:21 AM PDT

Lindsay Lohan and Mom Party Before Deposition

Lindsay Lohan is clearly in a better place now that her mom is in town -- actually, it's the same ol' place ... the Chateau Marmont where mother/daughter partied until 2 AM today.

If Lindsay made a beeline for home, she might get 5 or 6 hours of sleep before her deposition this morning ... if she doesn't appear this morning it will be her 3rd no-show and she'll probably lose the case.

Lindsay is being sued by passengers in a car who claim they were held hostage by LiLo during a crazy, drunken ride down Pacific Coast Highway in 2007.

Dina Lohan flew with Lindsay

yesterday to make sure she showed up this AM.  Right.