Jamie Lynn Spears by Barry King/ WireImage.com Jamie Lynn Spears by Barry King/ WireImage.com

Jamie Lynn Spears, 17, early Thursday morning gave birth to a daughter, whom she named Maddie, at the Mississippi Southwest Regional Medical Center. Young Spears' young 'un weighed in at 7 lbs., 11 oz., Us reports.

Big sis Britney was at Jamie Lynn's side, having flown home (commercial!) to 'Ouisiana earlier in the week.

This is the first child for JLS and her 19-year-old fiancé, Casey Aldridge. "Everyone is healthy and happy," People has learned from a source who apparently requested anonymity for fear that word will get out that it was he/she who divulged the scandalous news that everyone is healthy and happy. - Matt Mitovich

Related:
" Paparazzo Popped for Stalking Jamie Lynn Spears
" Is Jamie Lynn Spears Having a Baby Girl?
" Jamie Lynn Is Engaged, Y'all!