The young 20-year old woman was driven to a medical facility, suffering from a heat stroke.
The star’s spokesperson stated: "She was overheated and dehydrated."
The star of the movies Mean Girls, Freaky Friday and Just My Luck, among others, was treated at the hospital and released a few hours later.
Her spokesperson explained why she was sick: "She was filming in 105-degree weather for 12 hours."
California has been battling a heat wave for the past few days, the weather frequently reaching over 100 degrees.
Lohan should be back on the set Thursday. Georgia Rule is a drama starring, among others, Jane Fonda and Felicity Huffman.