Lohan entered her plea at the Airport Courthouse in Los Angeles before Superior Court Judge Keith L. Schwartz.
[Updated at 2 p.m.: Schwartz set her bail at $40,000.
"You're in a different situation now that a felony has been filed against you," Schwartz told Lohan. "If you violate the law, I will remand you and set no bail and your attorney won't be successful this time. ... You need to follow the laws just like everybody else. ... You're no different than anyone else, so please don't push your luck."
Deputy Dist. Atty. Danette Meyers asked that Lohan and her "agents" stay away from the store, which reported being "somewhat alarmed" after receiving flowers after the incident. The judge agreed and told the actress to stay away.
Lohan's attorney Shawn Chapman Holley said that Lohan has been complying with the terms of her probation and met regularly with her probation officer.
"A good probationer doesn't pick up a new case," Meyers said.
Lohan will return to court on Feb. 23.]
[For the record, 2:10 p.m.: An earlier version of this post said Lohan's bail was set at $20,000. Bail was set at $20,000 on the theft charge and $20,000 on the probation violation, for a total of $40,000.]
It's the latest brush with the law for Lohan, who is already on probation for a 2007 misdemeanor drunk-driving conviction. She also faces a criminal investigation in Riverside County involving allegations that she shoved a worker at the Betty Ford Center. She has not immediately commented on the latest charge, but her attorney has released a statement saying the actress would fight any criminal charges.
Prosecutors allege that Lohan stole a "one-of-a-kind" necklace, worth $2,500, that went missing last month from a Venice jewelry store not far from where she lives.
The piece, described as a gold necklace with semiprecious stones, disappeared Jan. 22 from the store in the 1300 block of Abbot Kinney Boulevard, and police began investigating a few days later. According to law-enforcement sources, Lohan was seen in a store security video wearing the necklace before it was reported missing.
Lohan could be ordered to return to a Beverly Hills court to determine whether the grand-theft charge constitutes a probation violation that would send her back behind bars.
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