Jamie Lynn Spears & Casey Aldridge: Wedding Planning!

It's hard for pregnant Jamie Lynn Spears to shock anyone these days.

After announcing her pregnancy in December, engagement news could be easy to overlook, but thanks to a recent outing in a T-shirt emblazoned with "The Rumors Are True" while sporting a shiny diamond ring on her left hand, Jamie Lynn has put many of the questions regarding her infamous relationship to rest.

"Jamie Lynn and Casey Aldridge are officially engaged," a close friend of the teen couple confirmed to OK!, one of our fave celeb news magazines.

"They're committed to each other and anxious to be the best parents they can possibly be; the best husband and wife they can be to each other."

The pregnant 16-year-old and Casey Aldridge won't be trading Louisiana for Los Angeles after the baby is born, an inside source close to Jamie Lynn Spears says.

The magazine confirms that the couple will wed in the Spears' quiet hometown of Kentwood, La., too - the wedding will reportedly take place at Serenity, the estate of big sis Britney Spears, who will likely be a bridesmaid.

Jamie Lynn and Casey Aldridge won't be rushing to the altar in the typical sense, however. The magazine's source reports she'll wait to get back into shape:

"I expect she'll want to wait several months to get her figure back so she can wear a beautiful wedding gown and then have her dream wedding."