The friend, who asked not to be identified because the family had not yet announced the baby's birth, told The Associated Press that the baby was named Maddie Briann and weighed 7 pounds, 11 ounces.It had been rumored that the newborn would be given a name that was a combination of her parents' names, either Cailynn or Cassie."They are surrounded by their close relatives, including Jamie Lynn’s older sister Britney, mother Lynne, father Jamie and brother Bryan," Spears' rep told OK! magazine. OK! also reports that Maddie Briann weighed 7 lbs, 11 oz.The 17-year-old Jamie Lynn was the star of Nickelodeon's "Zoey 101," a sitcom about prep school friends, and is the younger sister of pop star Britney Spears. The Spears family announced in December that Jamie Lynn was pregnant. The father is Casey Aldridge, a pipe-layer from Liberty, Miss. The couple is not married but announced an engagement several months ago.Ellen Brannan, spokeswoman for Southwest Mississippi Regional Medical Center, in McComb, would not give out any details. "We understand everybody's interested, but we don't give out information on anyone. Everyone's entitled to their privacy," she said.Celebrity Baby Boom
Jamie Lynn Spears and Casey Aldridge
It's a Girl! | June 19
The 17-year-old Spears and her baby girl Maddie Briann are "healthy and happy" following the child's birth. Britney Spears was at her sister's side for support.
Todd Williamson, WireImage.com
Laila Ali and Curtis Conway
Expecting
The former boxing champ and current 'American Gladiators' host and her ex-NFL player husband just tied the knot last July.
Mark Von Holden, WireImage.com
Dean McDermott and Tori Spelling
It's a Girl! | June 9
Stella Doreen McDermott, who weighed in at 6-pounds, 8-ounces, joins brother Liam in the Spelling-McDermott family.
Getty Images,Getty Images
Mark Wahlberg and Rhea Durham
Expecting
'The Happening' star and his longtime girlfriend already have two kids together: daughter Ella, 4, and son Michael, 2.
Getty Images
Jessica Alba and Cash Warren
It's a Girl! | June 7
The 'Sin City' starlet and her new husband welcome daughter Honor Marie Warren into their newly formed family.
Chris Pizzello, AP
Vin Diesel and Paloma Jimenez
It's a Girl! | April 2
Despite his daughter's fall birth, the 'Fast and the Furious' actor and his model wife wait nearly two months to share the news.
Getty Images,Getty Images
Gillian Anderson and Mark Griffiths
Expecting | Due Date Unknown
This will be the second child for the couple. Their son Oscar was born in 2006.
George Pimentel, WireImage.com
Michelle Monaghan and Peter White
Expecting | Late Fall
The 'Made of Honor' actress and her graphic designer husband are "very excited" about their impending child.
Getty Images,Getty Images
Joe Don Rooney and Tiffany Fallon
It's a boy! | May 31
The Rascal Flatts guitarist-singer and his wife named their first son Jagger Donovan Rooney.
Michael Buckner, ACMA / Getty Images
Jack Black and Tanya Haden
It's a Boy | Late May
The 'Tropic Thunder' actor and his wife give 2-year-old son Samuel a new baby brother, Jack Jr.
Kevin Winter, Getty Images
The younger Spears lives near Liberty with Aldridge, 19, and has been seen around the small south Mississippi town often as her pregnancy became more apparent. Her family owns a home across the state line in Kentwood, La.Spears announced her pregnancy through an article in OK! Magazine and was expected to receive a large payday for exclusive pictures of the newborn.Nickelodeon issued a statement about the birth on Thursday, saying, "We wish her and her family well." Nickelodeon spokeswoman Marianne Romano said that filming of the fourth and final season of "Zoey 101" was completed last summer before Spears became pregnant.Spears portrayed Zoey Brooks, a student at Pacific Coast Academy, a campus that had been an exclusive all-boys boarding school until Zoey and a handful of other girls arrived. At the end of the series, Zoey gets the boy - longtime crush Chase (Sean Flynn).Associated Press writers Erin Carlson in New York and Mary Foster in McComb, Miss., contributed to this report.Britney Owes Sis Jamie Lynn a Baby Gift
