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!.

This was actually the second shopping trip in a two days for the mom-to-be. On Thursday, the Zoey 101 star and her beau were spotted holding hands and acting "lovey-dovey" as they strolled through a mall in McComb.

Jamie Lynn and Casey, 18, stopped inside Hibbits Sporting Goods Store, where Brit’s little sis sifted through the athletic gear, picking out a pair of sneakers for Casey, as well as a few pairs of trademark athletic running shorts that cost $7.98 each. She paid for all of her purchases herself, which totaled around $300.

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