New Delhi: Actor Tahir Raj Bhasin has heaped praised on his "Force 2" co-star Sonakshi Sinha, saying that she is an "absolute rockstar". "I have to say that in this project, working with John Abraham and Sonakshi Sinha has been an absolute blast. Sonakshi is an absolute rockstar. She has got a great taste in fashion and music," Tahir said. The 29-year-old actor, who made his tinsel town debut with the 2014 crime thriller film "Mardaani", starring Rani Mukerji, also shared that his other co-star John Abraham has been like a mentor to him. "John has been a mentor on the sets... This is a physically demanding script than 'Mardaani'. John has helped me with fitness, diet and has even shared his physical trainer with me," he added. As a newcomer, how does he feel to work alongside Bollywood superstars? "I think it is a huge compliment that directors and producers see that I can match the game with these established actors," he said.