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Star magazine states:

“Conveniently, Casey falls under the bar by just 26 days.

“The man many suspect is the father, however, would face charges and probably prison time if he were to come forward and admit he had sex with her.”

The magazine quotes “two separate Spears family insiders” who believe the father is someone who works on Jamie Lynn’s kids’ show.

“Jamie Lynn has been working on Zoey since she was 13. In Hollywood, little girls grow up fast, and she is no exception.”

“With everything that has gone on in her family, she needed someone to look up to.

“But the man she found seems to have completely taken advantage of her.”

Another family source added:

“Some of us have doubts as to the legitimacy of the claim that Casey is the father.

“Before the news of the pregnancy, how often did you see them together?

“Jamie Lynn has dated Casey on and off over the past two years.

“But it was not steady. In fact, she was looking to date Kevin Federline’s brother about a year ago.

“Jamie Lynn went through a time of partying, and Casey was just a part of that.”

Even Casey recently posted on his own MySpace that he was feeling “blah” about his love life, and added: “Me and Jamie are over…”

In fact, Star claims he had a pregnancy scare with a different girl and had to confess to Jamie Lynn. A close friend told the magazine:

“Casey is a serial cheater who has lied to Jamie Lynn time and time again. This past spring, he was forced to tell Jamie Lynn that he’d cheated on her and gotten that girl pregnant.”

In fact, Star even insists Casey was openly dating yet another girl at the same time as he was supposed to be romancing Spears. “Yes, my sister is dating Casey - they’ve been dating for a while,” said Kevin Seals of his sister Whitney Seals.

“I know Jamie Lynn was real jealous about Whitney’s relationship with Casey.”

No matter who the father is, insiders believe the pregnancy will be the death knoll for Jamie Lynn’s burgeoning career. It will leave them terrified that she will prove to be the new Britney - and also that Nickelodeon, the TV channel behind Zoey 101, will be terrified of ruining its clean-cut image.

“I cant think of any way that Nickelodean could keep Jamie Lynn’s show on the air, said PR expert Michael Levine.

“If they do, advertisers will drop it like crazy. No advertiser wants to be associated with a minor getting pregnant.”