Pregnant Zoey 101 star Jamie Lynn Spears, 16, is engaged to 18-year-old Casey Aldrige, according to People.com. Spears, 16, has been showing off her sparkling engagement ring to friends and family around Louisiana and Mississippi, a source close to the family told the entertainment website. “She’s got an engagement ring,” the source says. “She’s been showing it off, talking about it.” Jamie Lynn, who is Britney Spears‘ younger sister, is due to give birth to Aldridge’s baby this summer.