Britney Spears sibling Jamie Lynn and her fiancé Casey Aldridge welcomed their daughter into the world today and named her Maddie Brianne.The 17-year-old new mother gave birth to her daughter at Mississippi Southwest Regional Medical Center in Mc Comb around 8.30 a.m. The baby was delivered through Caesarian and weighed 6 pounds, 10 ounces.Grandfather Jamie [...]