Mumbai Legendary superstar Amitabh Bachchan and son Abhishek have taken to Twitter to express their shock over the death of their Paa co-star, child artist Taruni Sachdev.The 14-year-old girl, who rose to fame as the Rasna girl after featuring in the soft drink ad, was among 13 Indians who died in Nepal plane crash. "Just reading that Tarini Sachdev the girl child artist in Paa, has perished in Nepal plane crash... please God may this not be true," Amitabh posted on his Twitter page. Abhishek tweeted: "SHOCKED and very saddened to hear about the Nepal plane crash. Lost 1 of my cutest co-stars. Little Taruni Sachdev from PAA. Speechless.