The heat wave is getting to LINDSAY LOHAN. “The Insider” has learned that the 20-year-old actress was taken by private car to an L.A. area hospital from the set of her new movie ‘Georgia Rule.’

“She was overheated and dehydrated,” Lohan’s rep, LESLIE SLOANE-ZELNICK, tells “The Insider”‘s MARC MALKIN. Sloane-Zelnick says the starlet spent a couple of hours in the hospital after being given a Vitamin B shot. “She was filming in 105-degree weather for 12 hours,” she said.

Lohan is expected to return to the set tomorrow. ‘Georgia Rule’ is a drama directed by GARRY MARSHALL and co-stars JANE FONDA and FELICITY HUFFMAN.