Britney Spears’ family have been rocked by another scandal – pregnant teen Jamie Lynn’s own birth was reportedly unplanned, and her father demanded a paternity test to make sure he was the baby’s daddy.

As big sister Britney battles bipolar disorder and 16-year-old Jamie Lynn prepares to become a young mom, the girls’ uncle has come forward with another past family secret. William Spears claims “history is repeating itself” – because Jamie Lynn wasn’t planned.

The relative tells In Touch magazine that the young actress’ father Jamie was concerned when his wife Lynne announced she was pregnant – because he had had a vasectomy after the couple’s second child, Britney.

Uncle Willie says, “Jamie got awfully mad. He said it couldn’t be his.”

William Spears alleges his big brother then demanded a DNA test that proved he was the baby’s biological father. He adds, “That’s why they named her Jamie Lynn, to kind of make the point that she was from both of them.”

The youngest Spears daughter stunned the world when she announced she was pregnant with boyfriend Casey Aldridge’s child in December.

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PS: This picture was taken today!  When is homegirl gonna start showing?

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Out of the spotlight after revealing her pregnancy, 16-year-old Jamie Lynn Spears is moving ahead with her life, passing her GED and thinking about college, a family friend said.

The Zoey 101 star passed her high school equivalency exam about a month ago – scoring particularly well on reading comprehension – and is looking to take the ACT college entrance test, the friend says.

“She’s already got her diploma,” according to the friend. “She wants to take her ACT. She’s not wasting any time. People don’t know her. When she gets something in her head, she’ll make it happen. Everybody is so supportive of her.”

Last month, Britney’s younger sister was photographed in Hammond, La., carrying a GED book. She was accompanied by her mom Lynne outside a building that houses both the Tangipahoa Parish School System Adult Education Center, which is a GED preparation site, and the Title I Parent Center, which teaches parents how to help their children develop learning skills.

Expectant moms often have a glow about them, but that certainly wasn’t the case with Jamie Lynn Spears on Feb. 2. When the 16-year-old went shopping with the father of her child, Casey Aldridge, at Wal-Mart near her hometown of Kentwood, La., “she looked depressed and stressed out,” store employee Sarah Lampton tells Life & Style. “She was wearing a big sweatshirt, blue jeans and dirty white shoes. She didn’t seem happy. It looked like she had a lot on her mind.”

That shouldn’t come as a surprise. A week earlier, her mother, Lynne Spears, had jetted off to LA to join Jamie Lynn’s father, Jamie, in the ongoing battle to save their older daughter, Britney Spears, 26. While the young actress understands that her sister is deeply troubled and needs care, “Jamie Lynn really wants to be near her mom,” says an insider close to the Spears family. “She pretends to be a self-sufficient young girl, but she really needs her mama right now.”

Luckily, Jamie Lynn, who’s due this spring, has been able to lean on Casey, 19. In recent days, the two have been spotted out and about, holding hands in Kentwood.

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After it had been revealed that Jamie Lynn Spears was partying it up over Superbowl weekend at Serenity, Lynne Spears hopped on a plane out of L.A. to get control over that situation.

Their kids have them pulled in all different directions lately.

Lynne Spears was spotted leaving her troubled daughter, Britney Spears’ home in Los Angeles shortly after midnight on Thursday — and turned up at her mansion, Serenity, in Kentwood, La. some 12 hours later. “She drove out of Serenity and went to the Sonic Burger,” an eyewitness in Kentwood said.

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While mom and pop are away, the kids will play!

Lynne and Jamie Spears are in Los Angeles to look after their eldest daughter, Britney, but Jamie Lynn made other plans in their absence. According to sources, she took the opportunity to throw a party for friends in their Kentwood home, Serenity, for the Superbowl.

At least five college aged students with Delta Delta Delta and Ole Miss decals on their Jeep turned up to join in the festivities. “They were all laughing. They looked really happy and excited to be at the house, like they hadn’t seen Jamie Lynn in a while,” said one witness.

Earlier in the day, Jamie Lynn drove Casey Aldridge to a Walmart in McComb, Mississippi, bypassing a closer on in Amite, Louisiana. Why? The one in McComb sells alcohol on Sundays!

Jamie Lynn Spears and her mother Lynne are at odds with each other. So much, that the younger Spears has got her sights set on moving in with her father, Jamie Spears, in Los Angeles.

Apparently, mother and daughter aren’t sticking together anymore during her unplanned pregnancy. According to sources, Jamie Lynn is going to leave their home in Kentwood, Louisiana. Lynne has reportedly said that Jamie Lynn’s boyfriend, Casey Aldridge, is off limits.

Of course she says that the other reason she wants to move out west is because she wants to be closer to film projects that she’d like to start after the birth of her baby.

But Casey is the main reason.

“Jamie Lynn loves Casey and wants to marry him, but her mom is dead set against it,” an Enquirer source said. “Jamie Lynn knows that once she’s out from under her mom’s thumb in Kentwood, she and Casey will be together.”

Lynne also worries that once her little girl’s in Los Angeles, she’ll fall under another negative influence — Britney!! “Jamie Lynn knows Britney smoked and drank during her pregnancy — and because Britney’s boys turned out fine, Jamie Lynn thinks her baby will be fine too,” the source confided.

Source, WENN