Britney Spears become aunt with a babygirl, according to a friend close to Spears' family, Jamie Lynn Spears gave birth to a baby girl Thursday morning at a south Mississippi hospital.

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.

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.

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.