Paris Hilton on a new jail house diet

Paris Hilton may have discovered the new starlet diet, which could be later followed by other members of young Hollywood.

According to pals, Paris is so terrified about going to jail that she isn't eating. Between lowering her calorie intake, the hotel heiress has also been excessively exercising to ensure she is fit enough for jail. The effect could see Paris rejoining the size zero club.

With Nicole Richie in legal trouble and Lindsay Lohan both in rehab, the trend could have disastrous effects.

A friend told PEOPLE magazine, "Paris hasn't been eating at all and her parents and friends are beyond worried about her. She breaks down crying a lot because she just can't deal with the reality and the pressure of everything that is happening"

The insider continues that Paris has discovered who her friends really are since being sentenced to jail time. It seems her friends didn't have a problem with the amateur porn film, the tabletop dancing or the less-is-best dressing but they can't get their pretty little heads around prison.

The source added, "As for her friends, that's been another spot of stress for Paris. She really can't take how most people around her have scattered and distanced themselves."

Since her sentence was handed down, Paris has been covering her already slender body with demure clothes and spending time with her immediate family. She will serve 23 days in prison starting June 5.