Paris Hilton is expected to plead guilty to two misdemeanor charges stemming from her arrest for drug possession last month at a Las Vegas hotel-casino. Clark County District Attorney David Roger says the celebrity socialite has agreed to plead guilty Monday to drug possession and obstructing an officer in Las Vegas Justice Court under the terms of a plea deal worked out with prosecutors after her Aug. 27 arrest. Hilton will serve a year of unsupervised probation and complete a drug abuse program under the plea agreement. She originally faced a felony cocaine possession charge. The 29-year-old Hilton was arrested inside the Wynn resort after police say a small bag containing 0.8 of a gram of cocaine spilled from her Chanel purse as she reached for lip balm.