Jamie Lynn Spears will marry fiancé Casey Aldridge before the end of the year, OK! magazine reports.

Big sister Britney Spears will be the 17-year-old former "Zoey 101" star's maid of honor at the wedding, and Jamie Lynn's newborn baby Maddie Briann may be carried into the ceremony by the bride and groom's mothers in a basket decorated with flowers, OK! reports.

Spears' new house is in Liberty, Miss. — just 30 minutes from her mom Lynne Spears' house in Kentwood, La. — and it sits on three acres, where she may put up a tent for a private, late fall ceremony.

"Her own backyard with just the people who matter most is. ... Jamie Lynn's style," a friend of the bride-to-be tells OK! "She's already down to her pre-pregnancy weight," adds the friend.

Spears and Aldridge, a pipe-layer from Liberty, Miss., welcomed Maddie at a hospital in McComb, Miss., on June 19.

Click here for the OK! magazine report.