Paris Hilton has agreed to plead guilty to misdemeanor drug possession and serve one year of probation, court documents show.

A plea agreement obtained by the Las Vegas Review-Journal indicates the American socialite will plead guilty Monday to misdemeanor drug possession and misdemeanor obstructing an officer.

The deal stipulates Hilton will serve one year in jail if she is arrested during the probation period.

Hilton was arrested Aug. 27 after a small bag of cocaine slipped out of her handbag and fell into the hand of a Las Vegas police officer.

"Defendant shall stay out of trouble. Defendant agrees that an arrest for any charge, excluding minor traffic violations for which a citation is issued, shall result in the immediate termination of her probation and the execution of the suspended sentences," the plea deal says.

Hilton must also follow a substance-abuse program, perform 200 hours of community service and pay a $2,000 fine.

"We fashioned a resolution which would give us complete control over her future. If she does not toe the line and stay out of trouble she will do one year in the Clark County Detention Center," Clark County District Attorney David Roger said.