Britney Spears and Jason Trawick were side by side last night on their way through LAX. They headed out of town after a fun family-filled few days of cheering on Sean Preston's Little League team and visiting Gymboree with both her oldest and youngest, Jayden James. Brit and Jason's final destination is San Francisco, where she's performing this Sunday inside the Bill Graham Civic Auditorium. Free tickets for the event went on sale yesterday morning, and they were gone practically instantly! Two fans actually paid a premium for their seats, with the proceeds going to benefit Japan relief — check out other ways you can help the tsunami-ravaged country. Brit will be back home in Southern California by next Tuesday, the day her album Femme Fatale is out, as she's scheduled to perform live on Jimmy Kimmel that night.