Hirani amusingly revealed Kareena's reaction when he called her up to discuss the film. "When I called Kareena for 3 Idiots she got excited and immediately told me that she wants to do the film. She didn't even read the script.
Kareena's mother is Sindhi and after having watched ‘Lage Raho Munnabhai' told her, `there's one Sindhi director who makes good films, work with him.' I told her, 'Please read the script before signing this film. Don't do this film because I' am Sindhi," Hirani said.
The actress later read the script and was excited at the opportunity of working with Aamir Khan. "Yeah, she heard the script, loved the script and she cried too. Apart from that, she was happy that she was getting a chance to work with Aamir," Hirani added.