Jamie Lynn Spears Has a Baby Girl, Maddie Briann

There is a new baby in the Spears clan! Jamie Lynn Spears and her fiancé Casey Aldridge welcomed a baby girl Thursday morning.

PEOPLE confirms exclusively that the baby was named Maddie Briann.

"Just the family was there," says a source about the birth around 9:30 a.m. at a hospital in Mississippi, near her Louisiana hometown. "Everyone is healthy and happy."

Jamie Lynn's sister Britney, father Jamie and brother Bryan flew in Wednesday to be with her for the birth; her mother Lynne had been with her helping her get ready for the baby.

CONGRATS, Jamie! Fourteen years from now you'll be a grandma.