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Sources are reporting that Jamie Lynn Spears has confirmed her pregnancy to OK! Magazine.

A source tells us the interview, which hits stands tomorrow, is six pages and is on the record with Jamie Lynn and her mother. She tells the mag that the father is Casey Aldridge, who she has been dating for some time and first met at church. Brit’s younger sister, star of Nick’s “Zoey 101,” says she’s keeping the baby.

Sources tell us that she has not yet told her older sister.

Nickelodeon issued the following statement this afternoon: “We respect Jamie Lynn’s decision to take responsibility in this sensitive and personal situation. We know this is a very difficult time for her and her family, and our primary concern right now is for Jamie Lynn’s well being.”

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Britney Spears’s 16-year-old sister Jamie Lynn Spears is pregnant.

Spears and her mother confirmed the pregnancy to OK! magazine, saying she was 12 weeks along and the father is Jamie Lynn’s longtime boyfriend Casey Aldridge. Aldridge’s mother confirmed it to TMZ.com.

“It was a shock for both of us, so unexpected,” Jamie Lynn told OK!, according to the Associated Press. “I was in complete and total shock and so was he.”

Spears told the magazine that after confirming the pregnancy with a home test and a subsequent doctor’s visit, she told only one friend – then waited two weeks before telling anybody else, including her parents.

“I needed to work out what I would do for myself before I let anyone’s opinion affect my decision,” she told the magazine. “Then I told my parents and my friends. I was scared, but I had to do what was right for me.”

Breaking the News to Her Parents

She told her parents just before Thanksgiving.”I didn’t believe it because Jamie Lynn’s always been so conscientious,” her mother, Lynne Spears, told OK!. “She’s never late for her curfew. I was in shock. I mean, this is my 16-year-old baby.”

Aldridge’s mother, Joyce Aldridge, told TMZ she was “aware of the recent interview regarding her and being pregnant” and that “we are in agreement with everything that was said by Jamie Lynn.”

“Everything is fine,” Joyce Aldridge added.

Spears, a high school junior who is 10 years younger than Britney, had until now escaped much of the attention about her personal life that has surrounded her sister.

Jamie Lynn stars as a schoolgirl at the fictitious Pacific Coast Academy in Zoey 101, finishing its third season next month as one of Nickelodeon’s highest-rated shows.

A rep for Spears was not immediately available for comment.

More from TMZ:

A source close to Britney Spears tells TMZ that the popwreck is “frantic” over the news that her baby sister, 16-year-old Jamie Lynn, is pregnant.

We’re told that before the news hit today, Britney was not aware of her little sis’ bun in the oven. Oops … a Spears did it again.

Recently, Britney was estranged from her mother Lynne, but has spent time with Jamie Lynn. TMZ cameras caught the younger Spears defending her older sister against an angry neighbor last October.

UPDATE: Nickelodean released the following statement:

Nickelodeon issued the following statement this afternoon: “We respect Jamie Lynn’s decision to take responsibility in this sensitive and personal situation. We know this is a very difficult time for her and her family, and our primary concern right now is for Jamie Lynn’s well being.”

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