Pregnant Jamie Lynn Spears celebrated her 17th birthday quietly with just fiance Casey Aldridge in Mississippi, reports, while the rest of her family was across the country in Brentwood, California.

Jamie Lynn hit up a local Wal-Mart and Ruby Tuesday restaurant just outside Kentwood, while big sis Britney, brother Bryan and his girlfriend, Lynne and Jamie dined with a group at Italian restaurant Peppone in Brentwood.

There was no mention of Jamie Lynn or the fact that it was her birthday at the Spears family dinner, an eyewitness told