BRITNEY HELPS JAMIE LYNN CELEBRATE AT BABY SHOWER

It was a family affair Saturday as mom-to-be Jamie Lynn Spears was feted with an intimate baby shower in Kentwood, La.

About 30 guests were invited — including big sis Britney — to Kentwood for a ladies-only, catered celebration for the 17-year-old at the family's Serenity mansion. (Spears hadn't been back to her hometown since her aunt's funeral early last year.)