E!News : Paris Hilton has been arrested on a cocaine charge in Las Vegas, cops said today. The socialite, 29, was a passenger in a car stopped by officers in the US city late on Friday. Her boyfriend Cy Waits, a night club mogul, was driving.

Cops became suspicious when they saw what looked like marijuana smoke coming from the black Cadillac Escalade. After a search, cops allegedly discovered Hilton in possession of a controlled substance. Tests later showed it was cocaine. It is not clear how much of the drug was found.

She was later released without bail — but faces jail if found guilty of possessing the drug. Hilton hasn't commented on the arrest publicly, but appeared to be tweeting in the hours following her brush with the law. After her arrest, she told fans she was in bed watching the television show "Family Guy" and later said she was going to bed. It wasn't clear if she or someone else was sending the tweets.

Her agent was not immediately available for comment today. A Las Vegas police spokesman said: "Officers noticed a vehicle leaving smoke trail of a controlled substance (and) made a stop based on that."

Hilton was arrested this summer after the Brazil-Holland World Cup game in South Africa, on suspicion of possession of marijuana. The case was dropped at a midnight court hearing. Hilton also pleaded no contest in 2007 to alcohol-related reckless driving and was sentenced to 45 days in jail. She was released after 23 days. (thesun)