Rohit Bal's impromptu gig on the ramp with his showstopper Sonam Kapoor on Bollywood classic Aa Jaane Jaa- added to the high-octane show the designer presented at the day four of India Bridal Fashion Week <br />Bal took to the stage from the front during the end of the show and started dancing towards Sonam, who was standing at the back, inviting her to join along.