क्यों! हो गया ना...

Vivek Oberoi as Arjun Khanna Gaurav Gera as Vinay Rahul Singh as Banna/Ranveer Singh Kajal Agarwal as Diya's Friend Arjun Mathur as Sumi (cameo) Tinnu Anand as Malhotra Dia Mirza as Preeti Jennifer Winget as Diya's Friend Aishwarya Rai Bachchan as Diya Malhotra Suniel Shetty as Ishaan Rati Agnihotri as Sulochana Khanna Anupama Kumar Amitabh Bachchan as Diya's Uncle Om Puri as Mr. Khanna

Shankar Mahadevan Playback Singer, Original Music Composer Vivek Oberoi Screenplay, Dialogue Javed Akhtar Lyricist Sunidhi Chauhan Playback Singer Raju Sundaram Choreographer Samir Chanda Art Direction Vijay Prakash Playback Singer Sudeep Chatterjee Director of Photography Dominique Cerejo Playback Singer Vaibhavi Merchant Choreographer Sadhana Sargam Playback Singer Loy Mendonsa Original Music Composer, Playback Singer Udit Narayan Playback Singer Boney Kapoor Producer Arjun Mathur Assistant Director Perry Costello Special Effects Coordinator Mahalaxmi Iyer Playback Singer Susheel Peris Digital Compositor Shaan Playback Singer Resul Pookutty Sound Designer Javed Ali Playback Singer Milap Zaveri Screenplay, Dialogue Ehsaan Noorani Original Music Composer