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With her July due date drawing closer, Jamie Lynn Spears celebrated her baby shower over the weekend — and, yes, big sister Britney Spears was there.

On Saturday afternoon, Jamie Lynn’s family and friends gathered at Serenity — the Kentwood, La. estate belonging to Lynne Spears (which Britney purchased) — to fete the 17-year-old mother-to-be. The low-key affair took place in the guest house, where the simple menu included cold cuts, juice and champagne.

“It wasn’t anything fancy or exciting,” a source says. “No big spread or fancy decorations. Just everybody sitting around and talking with each other.”

And just who is everybody? Well, in addition to the Spears women, the Spears men — father Jamie and brother Bryan — were in attendance. Several of Jamie Lynn’s cousins made the guest list as did some of her friends. Dad-to-be Casey Aldridge’s mother, Margaret Aldridge, was also there and was inseparable with Lynne. A source says they have been bonding over the phone the past few months, and have grown to be fast friends.

Britney, who hasn’t been to Kentwood in some time, was a popular party guest. Throughout most of the party she caught up with her cousins. She also made a point not to smoke around her pregnant little sister and even directed other people to smoke outside.

“She seemed like Britney again,” a source says. “She’s gonna be alright.”

The following day, the Britney and Jamie Lynn bonded while taking a drive together — without either of their parents in tow. Driving a borrowed car, they cruised along Louisiana back roads and made a pit stop at a local Sonic Burger.

“Both of them were just glowing, totally happy to be together,” says a source.

We love hearing that Britney is getting better and we hope Jamie Lynn is excited and happy about the journey she is about to embark upon.