Lindsay Lohan has made what looks to be another dumb decision. She's fired the woman most responsible for keeping her out of prison -- lawyer Shawn Holley.

As TMZ points out, Shawn has kept Linds "out of the pokey in the jewelry heist case as well as several probation violation cases. And she's almost magically made some criminal investigations disappear." This comes while the actress faces criminal prosecution in both California and New York. Attorney Mark Heller is repping her in the New York assault case, while Shawn Holley was repping her in multiple criminal cases in L.A. (Yes, Lindsay had lawyers for both coasts!)

Sources say Mark -- who's been called a "menace to the public" by some lawyers -- sent a letter to Shawn saying he was now representing Lindsay on all criminal matters.