If the delicate marquis-cut sparkler on her left ring finger says anything, it’s that Jamie Lynn Spears, who turns 17 on Friday, isn’t afraid to show off the evidence of her new engagement.

"Jamie Lynn and Casey are officially engaged," a friend of the teenage couple tells OK!. "They’re committed to each other and anxious to be the best parents they can possibly be, and also the best husband and wife they can be to each other."

The Zoey 101 star is expecting her first baby in late June with boyfriend Casey Aldridge, and is happily riding out the last months of her pregnancy with Casey by her side.

After announcing her pregnancy exclusively to OK! in December, Britney Spears‘ little sis has been busy lying low in her hometown of Kentwood, La. As OK! was the first to report, Jamie Lynn and a cousin recently registered for her baby shower at a Babies ‘R’ Us store in the nearby city of Baton Rouge.

And those closest to Jamie Lynn tell OK! the teen plans to stay true to her small-town roots, most likely exchanging vows with Casey in Kentwood at "Serenity," the estate owned by Britney — who obviously leads the list of possible bridesmaids.

"She’ll have the baby there, and soon after, she will also get married there," says a pal of the teen. "I expect she’ll want to wait at least several months to get her figure back so she can wear a beautiful wedding gown and then have her dream wedding."

For the full scoop on Jamie Lynn’s engagement, pick up the new issue of OK! — on stands everywhere Thursday!

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