The father of Jamie Lynn Spears baby is NOT boyfriend Casey Aldridge, showbiz. reports.

News that Britney’s sister was pregnant at 16 - under the legal age for sex in the U.S. - forced 18-year-old Casey into hiding.

Star magazine insists that the teenager may not be the dad - and that Spears’ friends and family think it is an older man who would face statutory rape charges.

Friends have said that Jamie Lynn was no longer even seeing Casey - and family members told Star that they believe the real father is a much older executive at her children’s TV show ‘Zoey 101′.

“Casey is being paid off to be the family’s fall guy while the real father remains unidentified,” Star magazine insists.

They say the real reason is that an older man could be charged with statutory rape if revealed to be the father of an under-aged girl’s baby.

But in Jamie Lynn’s home state of Louisiana, Casey would escape charges because a 16-year-old can legally have sex with someone less than two years older than her. “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,” Star magazine states.

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,” one of the sources said. “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…”