Britney Spears Arrives in Louisiana

Her flight landed at 12:53 p.m. CT, and Britney headed straight to mother Lynne's house.

Jamie Lynn, 17, is having a child (reportedly a girl) with fiancé Casey Aldridge, 19, and is set to give birth any day now, sources tell E! News.

Britney, 26, had previously been somewhat estranged from her little sister. But on May 3, she flew to Kentwood to attend Jamie Lynn's baby shower.

Because her visitations with her own children are still limited, Britney will miss visits with her sons, Sean Preston and Jayden James. Spears is expected to return to Los Angeles on Monday.