Two charismatic stars – Amitabh Bachchan and Hrithik Roshan – dazzled as the showstoppers for Karan Johar and Varun Bahl’s show at the HDIL-India Couture Week here, but it was Shah Rukh Khan who stole the show with his dimpled smile and impromptu jig.With Big B and Hrithik walking down the ramp with elan Thursday evening, the audience