A month after T-Mobile admitted that a hacker had gained access to the names and Social Security numbers of 400 T-Mobile customers, a spokesman for company confirmed Monday the authenticity of information from Paris Hilton's T-Mobile Sidekick (very hip device that allows owners to make phone calls, surf the Web, e-mail, instant message and take pictures) currently making the rounds on the Internet.

"T-Mobile's computer forensics and security team is actively investigating to determine how Ms. Hilton's information was obtained," the company said in a statement. "This includes the possibility that someone had access to one of Ms. Hilton's devices and/or knew her account password."

The Drudge Report said it confirmed many of the numbers and e-mail addresses, including those of rapper Eminem, actor Vin Diesel, actress Lindsay Lohan, singers Christina Aguilera and Ashlee Simpson, and tennis players Andy Roddick and Anna Kournikova. The FBI has reportedly opened an investigation.

21-year-old Nicolas Jacobsen ( charged with crime of hacking T-Mobile in October) pleaded guilty Tuesday to one felony charge of accessing a protected computer and causing reckless damage. He is scheduled to be sentenced in May and faces a maximum possible sentence of five years imprisonment and a $250,000 fine reports Zdnet