Las Vegas ? Just a few years ago, Paris Hilton claimed her lawless days were behind her after she served 23 days in jail for violating probation.

These days, however, it’s unclear exactly what the celebrity socialite learned from her time behind bars.

Hilton, whose partying brought her worldwide notoriety, acknowledged in a court appearance Monday that she stashed cocaine in her purse and lied to police during her arrest last month at a Las Vegas resort.

Under the terms of a plea deal, the 29-year-old Hilton pleaded guilty to drug possession and obstructing an officer, both misdemeanors. She must serve a year of probation, complete a drug program, pay a $2,000 fine and serve 200 hours of community service.

If she violates her probation, she could get a year in jail.

Hilton’s attorney David Chesnoff said she would attend an outpatient substance abuse treatment program.