Paris Hilton Paris Hilton

Even the home of an heiress isn't always a fortress.

A thief escaped with approximately $2 million worth of jewelry from Paris Hilton's Sherman Oaks, Calif. house sometime between Thursday evening and Friday morning at 4 a.m., LAPD spokesman Jason Lee told

"Based on the investigation, it was a lone suspect who entered the Hiltons' home," he said. Police are continuing their investigation.

Hilton was reportedly not at home during the robbery.