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Jamie Lynn Spears Shows Off New Engagement Ring to Friends

By Mark Lambert and Alicia Dennis

03/25/2008 at 01:00 PM EDT

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.

PHOTO GALLERY: Growing Up Spears

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