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Saif Ali Khan was initially offered the lead role, but he eventually turned it down.
Nargis Fakhri, the female lead of Rockstar, did not know Hindi when she was signed for the role.
Legendary actor Shammi Kapoor made his last on-screen appearance before passing in August 2011.
He played Ustad Jameel Khan, the first to recognise Janardan’s (Ranbir) exceptional musical talent.
A.R. Rahman brought in Michael Jackson’s lead guitarist, Orianthi Panagaris for the song Sadda Haq.
Brazilian model, Moufid Aziz, made his Bollywood debut, playing Nargis’s husband in the film.
Rockstar’s initial expected budget was Rs 45 crore, but the final budget went up to Rs 60 crore.
Rockstar was filmed in reverse to keep Ranbir’s hairstyle consistent, starting with the climax.
Ranbir Kapoor, Imtiaz Ali and Mohit Chauhan visited Delhi’s Hazrat Nizamuddin Dargah to seek inspiration.
The trio also launched the music of Rockstar at Hazrat Nizamuddin Dargah