The 20-year-old actress had been working for 12 hours in the intense heat and was taken to a local hospital for treatment before being released.
The Mean Girls star was spotted out the night before with pal Nicole Richie singing karaoke at West Hollywood nightclub Guy’s.
And hours after being treated for overheating and dehydration, Lohan was spotted having dinner at West Hollywood restaurant Il Sole on the Sunset Strip.
She reported to the film set on Thursday on time.
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