Britney Spears got an extra set of hands to help with her sons during an overnight visit with them on Saturday. The singer's mom, Lynne Spears, had arrived in LA on Wednesday and was there for the visit with her grandsons, Sean Preston and Jayden. Lynne also got to spend some one-on-one time with her oldest daughter, as the two of them went shopping and had sushi at Bond St. restaurant on Friday. According to witnesses, Britney seemed thrilled to be reunited with her mother. "Britney walked in with a big smile and introduced her mom to the staff," says an onlooker. "She looked gorgeous, and I have never seen her in a better mood. Britney seemed to have the best time hanging out with her mom and friends."