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Mitchell has hired attorney to the anti-stars, Gloria Allred, to represent her following an alleged altercation with Lindsay in a New York nightclub.
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But sources close to Lindsay say that the "Liz & Dick" star feels Mitchell made up the story about Lindsay punching her, so Lindsay has hired a P.I. to look into Mitchell and see if she has any criminal past or if she's done anything like this before.
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Getting a jump on the inevitable legal battle, Lohan reportedly wants to dig up as much information on Mitchell as she can, so she's ready should Mitchell pursue the case in civil court.
As TMZ first reported, Lindsay is telling friends she did not hit Mitchell and only confronted her because she thought Mitchell and her friends swiped her purse.