Imtiaz, Irshad's contribution immense in my career: Ranbir

Ranbir Kapoor says director Imtiaz Ali and lyricist Irshad Kamil, with whom he worked in 2011 hit 'Rockstar', have contributed a lot to his success in Bollywood. The 32-year-old actor was lavishly praised by fans and critics for his intense performance of a college student, whose turbulent love story turns him into a rockstar in the romantic saga. Ranbir is again collaborating with the duo in his upcoming movie 'Tamasha', which also stars his 'Yeh Jawani Hai Deewani' co-star Deepika Padukone."Their contribution to the film industry is well known and to my career it has been immense. I cherish working with Imtiaz. He and Irshad are responsible for what I have achieved in Bollywood with 'Rockstar'.