Spears broke the news to her mother, Lynne, just before Thanksgiving, the magazine reported.

"She was very upset because it wasn't what she expected at all," Spears said. "A week after, she had time to cope with it and became very supportive."

Lynne Spears, already grandmother to Britney's young sons, told the magazine: "I didn't believe it because Jamie Lynn's always been so conscientious. She's never late for her curfew. I was in shock. I mean, this is my 16-year-old baby."

She said her actress daughter, the telegenic heroine of her popular Nickelodeon series, has known Aldridge for years and began dating him in high school.

But in a recent interview with The Associated Press, Spears said she had no steady boyfriend. "I kind of just keep my options open," she said. "I have a bunch of friends that I always hang out with, a bunch of guy friends." She declined to talk about her older sister.

Spears spoke to the AP shortly before Thanksgiving, the day she told OK! she informed her mother about the pregnancy.

Jamie Lynn plans to raise the baby in her home state of Louisiana — "so it can have a normal family life."

Nickelodeon released a statement: "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."

A publicist for the network did not immediately respond to phone and e-mail requests for additional comment.

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