Jamie Lynn Spears spent her 17th birthday partying it up in a manner more fitting big sister Britney: shopping at Walmart and going to dinner at Ruby Tuesday. Apparently the Spears family does little to combat the stereotypes of the south (what with Britney’s old “I can drive with my kid on my lap, I’m country, that’s what we do). Jaime Lynn’s trying to keep it simple, and you can’t really fault her for that. She spent the afternoon shopping at her local Walmart with baby daddy Casey Aldridge, then the pair hit up Ruby Tuesdays for a romantic dinner. While I’ve never actually set foot inside a Ruby Tuesdays, from glancing in the window I can tell you with some confidence that a plastic carnation in a grocery store vase does not equal a romantic setting. But if you want a mediocre steak at a good price, it’s the place to be.

While most young women turn their 17th birthday into a bawdy bash to remember, OK! can report that America’s most famous pregnant teen, Jamie Lynn Spears, who rang in her last year as a minor on Friday, chose to spend that special day relaxing with fiancé and father of her baby, Casey Aldridge.

Jamie Lynn and Casey spent most Friday relaxing in his hometown of Gloster, Miss., a short drive from the Spears family home in Kentwood, La. Sources tell OK! the lovebirds stayed indoors for most of the big day, emerging later that evening only to make a quick shopping trip to a Wal-Mart supercenter in McComb, where they spent about an hour inside the store. And for a few minutes, the small-town charm of McComb, with its population of 13,500, suddenly began to resemble Hollywood, as local police were called in to keep back photographers and fans. “Jamie Lynn looked super happy and kept smiling inside the Wal-Mart,” one shopper tells OK!.

[From OK!]

Everyone’s making jokes about how Jaime Lynn isn’t with Casey for his money after that meal. But I could kinda joke that he’s not with her for her money either: OK reports that Jaime Lynn went shopping for Casey and bought him several pairs of sneakers at Hibbits Sporting Goods Store – each one retailing for $7.98. No one seems to know what Jamie Lynn got for her birthday from the father of her child, but I’m guessing it was an extra large milkshake.

Here’s Jamie Lynn on her way to Ruby Tuesdays yesterday. Images thanks to Splash.