Aditya (Akshay Kumar), an automobile engineer in a car company, is as passionate about cars as Shakespeare was about writing. Not only is he an engineer, but also a test driver for the company. A post like that can explain how well he could drive.
Aditya is engaged to Sonia (Bipasha Basu), a fashion designer about to make her mark in the field. As individuals, Aditya and Sonia were not on the same wavelength. Sonia was a 21st Century woman for whom career came first and she believed in changes. And as much as Aditya tried to overlook those facts, they kept coming in the way.
Though the marriage date is fixed, Aditya had to leave for Canada to learn about the technique of a new car model, to be launched in India; while Sonia had to leave for Paris for a fashion show.
Aditya arrives in Canada where his sister Simran (Bhagyashree) is living. He meets the family but cannot live with them as the company has given him an apartment close to the workshop. But he makes it a point to meet the family on weekends.
In between work, co-incidence or destiny makes him bump into Jia (Katrina Kaif) more than once. Jia, daughter of business tycoon Yashwardhan Birla, has come to Canada all alone to shop for her wedding with the business giant, Karan Oberoi (Anil Kapoor).
Jia was a simple girl with simple needs. She had got everything she could ask for in her childhood, but never time from her ever so busy father. And now the man her father had chosen for her hardly had any time to spend with her too. And that is when she found a friend in Aditya. Aditya and Jia manage to spend time with each other and as time passes, the friendship between them grows.
Being an amazing driver, Aditya gets a chance from his company to participate in a car rally. And somehow he persuades Jia to participate with him, and wins it too. On returning from the destination of the rally, their car gets stuck in the snow and they have to spend the night together. They share intimate moments, which make them forget that they were engaged, but not to each other.
With passing time, they fail to realize when they start falling in love with each other. But a misunderstanding with Aditya. Jia tells Aditya that she believes her father is responsible for her mothers death. Aditya tells his best friend, Nawab, this, and Nawab on a drunken night tells his friend, who is a reporter this. The reporter reports it in the morning papers. Jia, extremely hurt, returns to India to marry Karan. Aditya also comes back to India to get married with Sonia and does not attempt to meet Jia ever again. But fate makes them meet for the last time â€“ at Jiaâ€™s wedding.
Sonia is the designer at Jia's wedding, and she asks Aditya to bring the wedding dress for the bride, Jia. They meet, but don't say anything to each other. Mr Oberoi asks Aditya to come to the wedding, and Sonia manages to persuade him to come. Jia's friend and Karans secretary Jenny bumps into Nawab, who once again is drunk, and reveals that it is his fault that Jia's secret was published in the papers. But it is too late. Jia is already married to Karan. She goes to meet Aditya in order to tell him that she is sorry. They meet, confess their love and agree never to meet again. But Karan catches them talking and asks Jia what is happening. She says that she only loves Karan and that Aditya is just a good friend who is she feelings for. When Aditya is leaving the wedding, he finds an upside down car, in which Jia is. She has had a car accident. Petrol is leaking, and Aditya goes in the car to help Jia out. The car catches fire just as Aditya manages to free Jia. He helps her out of the car, while the press and public have gathered around to see what is going on. Aditya accompanies Jia to Karan, telling him that Jia only belongs to him, no one else. Karan pulls Jia's mangal Sutra off, and tells her to marry Aditya, and the movie ends with both of them hugging.
On this page: Read about Humko Deewana Kar Gaye story, Humko Deewana Kar Gaye synopsis and preview