According to TMZ, the Mean Girls star instigated an argument with the woman on Saturday night (April 7), which the latter then reported to the West Hollywood Sheriff's Department.
The incident apparently started after Lohan became jealous when she saw the woman speaking to one of her male friends, though no further information is known.
Lohan's rep Steve Honig has vehemently denied the story, insisting that the actress is innocent.
"Lindsay was absolutely not involved in any sort of altercation whatsoever. This is clearly another case of someone looking for money and 15 minutes of fame," he said in a statement.
Lohan, who recently completed a mandatory probationary sentence, has insisted on focusing on rebuilding her career following her legal troubles.
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