Ranbir Kapoor and Diana Penty signe to play role in a Film 'Rockstar'

Rockstar is Imtiaz’s most ambitious project till date. Initially, John Abraham was supposed to star in the film and it was to be produced by UTV. Then Love Aaj Kal happened and Ranbir and Ashtavinayak came on board instead.

Imtiaz has apparently been ambivalent about who to sign as Ranbir’s love interest in the film – a new face or an already established actress from Bollywood. For some time he even toyed with the idea of roping in one-film-old Anushka Sharma fort he film, but later dropped the idea.