Lindsay Lohan pleaded not guilty Wednesday to felony grand theft of a $2,500 necklace – the most serious charge yet filed against the troubled starlet who has wrestled with drug and alcohol abuse for years.

 "You're in a different situation now that a felony has been filed," Superior Court Judge Keith Schwartz scolded Lohan after she entered the plea through her attorney. "Everybody else has to follow the law. You're no different than anyone else. So please, don't push your luck."

Saying it appeared Lohan had violated her probation in a 2007 drunken driving case, Schwartz set bail at $40,000 and warned that if she was accused of breaking the law while free, he would have her held without bail.

Lohan, 24, posted bail and was released about an hour after the hearing. She spoke little during the arraignment, except to acknowledge her name and that she understood the charge and possible consequences.

Lohan could face up to three years in state prison if eventually convicted of stealing the necklace in January from a Venice Beach store.

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