Their stylists outdid themselves when Jaden,12, and Willow Smith,10, appeared in Tokyo for the premier of Jaden’s movie “Karate Kid.” They didn’t hold back on the studs and skulls and crosses because fashion is very important in Japan. Fans there loved the Smith kids and paid scant attention to Jaden’s costar Jackie Chan. Will and Jada just stayed in the background as well, and surrendered the limelight to the next generation.