Who is Ranbir's mystery girl?

The curiosity over the casting of the leading lady opposite Ranbir Kapoor in Imtiaz Ali's ambitious project, Rockstar is still on. Even as news is doing the rounds that leading model Diana Penty was zeroed in on for the role, latest buzz has it that she is no longer a part of the project. Reportedly, Imtiaz has now finalised a London-based Pakistani girl for the lead role. However, her identity has been kept under wraps.

"There have been many names circulating ever since the film was announced. There were reports that Anushka Sharma will play the lead followed by news that a Delhi girl was chosen. Diana Penty too was not roped in as she apparently failed the look test for the film. Now everyone wants to know who is this Pakistani girl he has picked?" said a source.