Tara Reid, the actress from the "American Pie" films, says she was at a hotel in Rosemont when someone slipped a drug into her drink.
She tells TMZ she left her drink at the hotel bar to smoke, and came back to find it covered with a napkin.
Reid says she was unconscious for eight hours.
She is now urging people always keep an eye on their drink.
Rosemont police say they got a call for a sick person but have not confirmed any drugging.