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Lindsay Lohan is expected back at work today after paramedics were called to her penthouse at the Ritz-Carlton Hotel in Marina del Rey, Calif. this morning.

The producers of Lohan's latest movie, Lifetime's Elizabeth Taylor bio-pic "Liz & Dick," called 911 at 10:15 a.m. PST after she didn't come out of her room as scheduled. The L.A. County Fire Department told ABCNews.com that they described an "unconscious person" in the penthouse.

Lohan's rep, Steve Honig, said the actress was asleep when the call was made. He blamed her inability to wake up on exhaustion and dehydration from long days on set.

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"She was on set last night at 7 p.m. and worked through the night until 8 a.m. this morning," he said. "She took a nap before shooting her final scene. Producers were concerned when she did not come out of her room and called paramedics as a precaution. Lindsay was examined and is fine, but did suffer some exhaustion and dehydration."

Honig added, "Lindsay was never taken to a hospital; reports to the contrary are false. She is resting now and is hoping to be back on set later this afternoon."

The Los Angeles County Sheriff's office described Lohan's condition as "groggy" and said she's "OK as far as we know."

Lohan has been to rehab multiple times for drug and alcohol abuse. In March, she was taken off probation from her 2007 DUI case.

Lohan has had a rough run of late. Last week, she totaled her Porsche by driving it into a dump truck on the Pacific Coast Highway.

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