With her mother out of town, a heavily pregnant Jamie-Lynn Spears headed off to a Mother's Day service at Galilee First Baptist Church with fiance Casey Aldridge, his mother and his sister on Sunday (May 11).

According to a source on the scene, after spending about an hour inside the church, the family left and went for lunch before making their way back home.

And as her due date approaches, many are wondering when Jamie-Lynn and Casey plan to tie the knot - with rumors claiming that the two are being urged to get hitched sooner than later.

"Jamie Lynn is having a shotgun wedding, and it's Lynne who is holding the shotgun!" a family friend told Star. "Lynne is determined not to let her younger daughter be a single mother," the pal adds.

But the thought of being Mrs. Aldridge apparently isn't sitting too well with Jamie-Lynn, as the insider alleges: "She's told her parents that she will not commit to a date. I just don't think she wants to marry Casey."

Gossip Girls

Enjoy the pictures of Jamie-Lynn Spears and Casey Aldridge out celebrating Mother's Day (May 11).