Jamie Lynn Spears will marry her fiance, Casey Aldridge, in a late fall ceremony according to OK! The teenagers will wed in the backyard of their new home in Liberty, Mississippi. The wedding will have a Southern feel and according to OK!, Jamie Lynn will wear a strapless dress purchased from a store in Baton Rouge. Big sis Britney Spears will be maid of honor, and Casey’s sister Ashlee will be a bridesmaid. As for the couple’s seven-week-old daughter Maddie, she might carried into the ceremony by the bride and groom’s mothers.