Britney Spears seemed to be in a jovial mood as she went shopping for little sister Jamie Lynn's birthday presents. The pop star stopped by the corporate offices of Ed Hardy with her mom Lynne Thursday to buy her pregnant sister gifts. Jamie Lynn turns 17 Friday, April 4.

According to the store's rep Nicole Irving, the "Toxic" singer was "in good spirits" during the whole trip. She stopped in the afternoon to visit designer Christian Audigier and viewed his spring collection.

The rep says, "Christian and she were laughing as she tried on Ed Hardy sunglasses and checked out the bathing suits."

Spears, 26, picked out a large selection of Christian Audigier handbags, scarves, and Crystal Rock T-shirts for Jamie Lynn. She also got things for her dad Jamie and brother Bryan.

She had spent the morning visiting her sons Sean Preston and Jayden James at her Studio City house.

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