Jamie Lynn Spends 17th Birthday Shopping, Eating Out

Jamie Lynn Spends 17th Birthday Shopping, Eating Out
Jamie Lynn Spears

04/05/2008 AT 11:30 AM EDT

Jamie Lynn Spears celebrated her 17th birthday with fiancé Casey Aldridge having dinner at Ruby Tuesday and shopping at Wal-Mart, a source says.

"They both seemed really happy, both in really good moods," the source tells PEOPLE of the couple's outing near Aldridge's home in Liberty, Miss. "Jamie Lynn had a big smile on her face."

Spears, who is pregnant with Aldridge's child, took in a quiet dinner with Aldridge, 18, at the restaurant.

"It was just the two of them," says the source. "They were like a little adult couple, very low-key."

They then went to Wal-Mart, where Spears looked at sleeping bags. Jamie Lynn recently has been flashing a big ring from Aldridge. They are expecting their baby this summer.

Meanwhile in Los Angeles, Jamie Lynn's big sister Britney Spears gathered with the rest of the Spears clan for a family dinner in Los Angeles.

Britney, parents Lynne and Jamie and brother Bryan joined a group of about 10 people for an Italian feast at Ristorante Peppone in Brentwood.

She (Britney) was in a great mood, and had dinner with her family and friends," a restaurant source says.

• Additional reporting by PERNILLA CEDENHEIM

Jamie Lynn Spends 17th Birthday Shopping, Eating Out| Britney Spears, Jamie Lynn Spears

Casey Aldridge, Jamie Lynn

Fame Pictures

• Reporting by MARK LAMBERT

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