According to police, Paris Hilton was the passenger in a vehicle that was pulled over by cops after noticing smoke that smelled like marijuana coming out of the car's windows around 11:30 p.m. outside the Wynn Hotel, where Hilton's boyfriend Cy Waits runs a nightclub.
The 29-year-old heiress was arrested and booked into the Clark County Detention Center for possession of a controlled substance after cocaine was found in her purse. The driver of the car was also arrested on DUI (drug-related, not alcohol) charges.
She was released without bail around 2:30am PT on Saturday.
This is the third time that Hilton has been linked to drugs since this summer. In July, she was detained in South Africa for alleged marijuana possession. A few weeks later, Hilton was reportedly stopped in France after local authorities found less than a gram of marijuana in her purse.