LAS VEGAS -- Paris Hilton was released from a Las Vegas jail Saturday morning after being arrested late the night before on suspicion of cocaine possession, police said Saturday.

The hotel heiress was riding in a black Cadillac Escalade which was pulled over in front of the Wynn Hotel on the Vegas strip at about 11:30 p.m. after police noticed what they suspected was marijuana coming from the SUV, a police spokesperson said.

The driver, who police did not identify, was arrested for driving under the influence.

During the stop officers found what appeared to be a controlled substance on Hilton and tests showed that it was cocaine. It is not clear how much of the drug was found.

Police spokesman Marcus Martin described events leading up to Hilton's arrest.

'Officers noticed a vehicle leaving a smoke trail of a contolled substance (and) made a stop based on that,' he said.

Hilton was quickly recognized by passers-by and a crowd gathered around the area where the vehicle had been pulled over.

Hilton was taken to the Clark County jail. She was released after authorities determined she was not a flight risk, Holman said.

Last month, Hilton was briefly detained in South Africa for allegedly smoking marijuana at the World Cup. Her publicist called the July 2 incident "a complete misunderstanding," and the case was dropped.

Four years ago the reality TV star was arrested for driving under the influence of alcohol and sentenced to 45 days in prison.