By SARAH BULL Little trendsetter: Willow Smith showed off her new 'do as she stepped out with waist-length neon hair braidsShe's arguably one of the trendiest children on the planet, so it;s no wonder Willow Smith is intent on constantly changing up her style.But having waist-length neon braids put in could perhaps be labelled one of the 10-year-old's boldest moves.Willow showed off her new 'do