Paris Hilton (L) speaks to the judge, as her attorney David Chesnoff watches, at the Regional Justice Center in Las Vegas, Nevada September 20, 2010.[Photo/Agencies]

Paris Hilton (C) is directed to a seat as she arrives at the courtroom with her attorney David Chesnoff (L) at the Regional Justice Center in Las Vegas, Nevada September 20, 2010.[Photo/Agencies]

Paris Hilton pleaded guilty on Monday to cocaine possession and was fined $2,000 by a Las Vegas judge and ordered to complete 200 hours of community service.

Hilton, 29, was also given a one-year, suspended sentence and warned that any new arrests in Las Vegas would result in her going to jail.

Hilton could have been jailed for up to four years on the cocaine possession charge, but she reached a plea deal with prosecutors over her arrest on the Las Vegas strip on August 28.

"The purpose of this is that you change your conduct," Las Vegas justice Joe Bonaventure told Hilton at a brief hearing.

"I assure you that Clark County Detention Center is not the Waldorf Astoria," Bonaventure added. The Waldorf Astoria in New York is part of the Hilton group of hotels founded by Paris Hilton's great-grandfather Conrad Hilton.

The sometimes actress and celebrity socialite and her boyfriend, nightclub manager Cy Waits, were stopped by police just before midnight after they said they smelled marijuana coming from their vehicle.