SHERMAN OAKS -- Police are still investigating a robbery that occurred at the home of Paris Hilton, but the socialite says she has a an idea of who is responsible. In an interview with "E! News," Hilton said she believes the burglary that cleaned her out of $2 million worth of jewelry was an inside job, and that whoever broke in had been to her home before.

Hilton said all of her jewelry was taken, including gems given to her by her grandmothers.

Los Angeles Police Department spokesman Richard French said a man in a hooded sweatshirt and gloves ransacked her bedroom around 4 a.m. Friday. Detectives from the LAPD's Van Nuys division responded to a call from a security guard.

Initial reports claimed the thief forced entry through Hilton's front door, but sources inside the investigation say the burglar may have entered the house by other means.

Hilton was not home at the time of the break-in, French said, but her home, located in the 3300 block of Clarendon street, in Mulholland Estates area, is equipped with security video equipment. Police said these facts lead them to believe that the thief was not a seasoned burglar.

"I expect we'll be able to apprehend the culprit here based on some of the information we have," said Deputy Charlie Beck, head of the LAPD's detective bureau.

Early on, sources at the LAPD said detectives have not ruled out that the suspect may be familiar with the mansion and neighborhood.

Investigators said they do not believe this case is anyway connected to last year's series of serial burglaries that targeted celebrities in the Westside.

In those cases, the two -- and possibly three -- men, clad in black and wearing ski masks and gloves, hit more than 70 homes in areas such as Bel-Air, Beverly Hills, Holmby Hills and the hills above Encino, usually at night and often on weekends.

Among the victims in those burglaries were former Paramount Pictures chief Sherry Lansing and her Oscar-winning director husband, William Friedkin, Clippers basketball star Cuttino Mobley, Duran Duran guitarist John Taylor and his wife, Juicy Couture president Gela Nash-Taylor and country music stars Tim McGraw and Faith Hill.

Hilton recently told Esquire magazine about her home: "The best thing I've ever bought with money is my house. Having a nightclub in your house really helps for having a party."

In 2004, several thousand dollars worth of jewelry, money and other valuables were taken from a home Paris Hilton shared with her sister Nicky.