Spears and fiance Casey Aldridge welcomed Maddie Briann at a hospital in McComb, Mississippi, on June 19.
Jamie Lynn Spears poses with her on the cover of OK! magazine - as expected, given the fact that Spears announced her pregnancy through an article in OK! and reportedly was to receive a large payday for exclusive pictures of the baby.
The photos were taken at the pair's Mississippi home. The magazine does not comment on the terms of its deals with celebrities.
In an interview with OK!, the 17-year-old Jamie Lynn said she had been nervous about giving birth "but it all fell into place. I was right on schedule. I had a perfect pregnancy and a perfect delivery. I was very blessed."
Jamie Lynn said watching Aldridge, a pipe-layer from Liberty, Mississippi, hold Maddie for the first time "was the coolest thing. ... He was so happy, and that made me the happiest person alive."
Jamie Lynn's immediate family - including big sister Britney - where there for the birth, though Aldridge was the only one allowed in the delivery room.
"It was such a big day," she said. "And being able to have your sister there, your whole family there, meant a lot. Everybody flew in to celebrate."
Lynne Spears, already grandmother to Britney's young sons, told the magazine: "You never remember how little they are, and then you hold them. I purred like a kitten, and I remember saying, 'Jamie Lynn, she's so beautiful.'"
Jamie Lynn thinks Maddie takes after daddy.
"As much as I'd like her to look like me - I just carried her for nine months - she looks like Casey! He reminds me of it every day," she said.
Jamie Lynn said Maddie sleeps in a bassinet by the couple's bed because she's "not ready to put her (in the nursery) all the way across the house."
She said Lynne Spears is a hands-on grandma.
"Mama has been here a bunch," she said. "She wants to see the baby all the time. She told me the doctors are always going to be real strict and tell you, 'Don't do this and don't do that.' Just follow your instincts. You're the mother and you know what your baby needs. That's what I've done and it seems to have worked."
Jamie Lynn, who recently starred on the Nickelodeon sitcom Zoey 101, said she plans to raise Maddie in the US South where "the focus is family."
"I would love being the soccer mom," she said. "They don't have football down here, but I would love being the softball mom driving the kids around."
