Jamie Lynn Spends 17th Birthday Shopping, Eating Out

04/05/2008 at 11:30 AM EDT

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