Update: Lindsay Lohan Stable After Medical Emergency in Marina del Rey

Update 12:10 p.m.

TMZ is reporting that Lindsay Lohan was not taken to the hospital. She was unresponsive when a staffer attempted to wake her up, so 911 was called. Paramedics responded and determined nothing was wrong with Lohan, according to TMZ.

Sources tell TMZ that Lohan had been shooting for two days straight and was exhausted, but she is now back on set shooting "Liz and Dick,"  a made-for-television movie in which she portrays screen legend Elizabeth Taylor.

Her spokesman, Steve Honig, told E! News that Lohan had been working a "grueling schedule," so she was resting and was expected to be back on the set later today for her latest film.

Lohan, 25, remains on unsupervised, summary probation stemming from the theft of a necklace from a Venice jewelry store. Her probation from a 2007 Beverly Hills DUI case ended March 29 after she successfully completed her community service and counseling hours.

On June 8, Lohan was involved in a traffic collision on Pacific Coast Highway in Santa Monica, with her black Porsche rear-ending a dump truck. The crash remains under investigation, with police saying they were working to determine if Lohan was driving.

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12:00 p.m.

ABC7 is reporting that actress Lindsay Lohan has been hospitalized after being found unconscious in a penthouse at the Ritz-Carlton hotel in Marina del Rey.

Los Angeles County Fire Department officials say a crew responded to the hotel at 10:15 a.m. on a report of an unconscious person, but did not transport anyone to a hospital. Officials cannot confirm if the person was Lohan.

Lohan is currently filming "Liz and Dick" in Marina del Rey. 

City News Service contributed to this report.