03/25/2008 at 10:00 AM EDT
Jamie Lynn Spears is sporting some sparkling new jewelry – an engagement ring from fiancé Casey Aldridge.
Spears, 16, has been flashing the rock to friends and family around Louisiana and Mississippi, a source close to the family tells PEOPLE.
"She's got an engagement ring," the source says. "She's been showing it off, talking about it."
Spears and her 18-year-old fiancé
are expecting the baby this summer. No official word yet on a wedding date for the couple.
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