Lynne Spears thought Jamie Lynn Spears was a virgin before she told her she was pregnant.
Lynne - mother of both Jamie Lynn and pop princess Britney Spears - believed her daughter was playing a prank on her when she said she was going to have a baby.
She told U.S. TV program "The Morning Show with Mike and Juliet": "I thought she was joking when she first told me. I was looking at her face trying to wait for the punch line; wait for her to smile or joke."
"She wanted the baby from the beginning."
Lynne - who recently released a book documenting the lives of her showbiz daughters, Through the Storm - also confirmed "Zoey 101" star Jamie is still with her fiance and the baby's father Casey Aldridge, despite rumors they had split."
Lynne - who labeled herself as her daughters' "cheerleader" and not a pushy parent - added: "She and the baby's father are on. You can't believe the media. I don't know why they do that."
Earlier this week, Jamie Lynn, 17, was rumored to be pregnant with her second child, but a spokesperson for the star denied the claim.
She gave birth to daughter Maddie Briann in June.
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