Mom-to-be 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.