Britney Spears was spotted in LA with a smile on Friday. She arrived right on time for Sean Preston's kindergarten graduation, which her mom Lynne and boyfriend Jason Trawick also attended. Britney had a busy weekend ahead of her, since she traveled to the Bay Area for a Saturday night performance in San Jose. We were front row at the concert, where Britney rocked sexy ab-baring outfits and belted out her latest hits. Britney Spears kicked off her tour on Thursday in Sacramento, though she's headed back toward home now for a show at the Staples Center this evening. Brit also just released the sneak peek teaser for her "I Wanna Go" music video, which will debut in full later this week.