The butler did it?

Or perhaps it was a member of the security detail. I'm definitely ruling out Professor Plum in pantry with a briefcase.

In any event, police now believe that a jewelry heist at Paris Hilton's Mullholland Estates homes was an inside job. Here's what the LA Times is reporting:

LAPD investigators believe the $2-million jewelry heist at Paris Hilton's Mulholland Estates mansion last month was probably done by someone familiar with the home's layout and who knew how to access the socialite's collection of rings, watches and necklaces.

Detectives are investigating a number of potential suspects based on information gathered from the scene and interviews with Hilton, who is cooperating with police.

Hilton's bedroom was ransacked during the overnight burglary, but police sources said security video showed a thief who knew the home and was able to quickly find Hilton's jewelry collection, which includes several family heirlooms. The jewelry was in a place that was not accessible to someone simply searching the home, police said.