The Spears clan just grew by one.

Britney's little sister, Jamie Lynn, gave birth to a baby girl on Thursday.

Jamie Lynn popped out Maddie Briann at Mississippi Southwest Regional Medical Center in McComb, Miss. She weighed 7 lbs., 11 ounces.

Her baby daddy Casey Aldridge was there as well there for the birth as Britney and her father Jamie.

Spears' pregnancy is, of course, controversial since she was only 16 years old when she got knocked up. She's also the star of "Zoey 101," a very popular kids show on Nickelodeon.

Casey and Jamie Lynn are evidently engaged to be married, but they put off the wedding until the baby was born.

Notice there's no last name, I wonder if Maddie Briann will be a Spears, Aldridge or both.