Madhav Shastri (Madhavan) aka Maddy is a slaphappy lad studying mechanical engineering in college. As a carefree juvenile he likes to play truant at college and pick up fights over mere trivialities. Madhav's bully nature wins him some adversaries in college. Among them is Rajeev Sharma (Saif Ali Khan). A slight tiff between the two gets Rajeev suspended from the college. But once the college is over everything is conveniently forgotten. Madhav undergoes a transition and matures into a goody-goody fellow. The guy who never believed in anything called love falls head over heels for a gorgeous girl Reena Malhotra (Diya Mirza). Armed with tips (to woo Reena) from his friendly dad DD (Anupam Kher) and favorite sidekick Keki (Hrajesh Virjee) Maddy makes amorous advances but soon gets a shock when he comes to know that the lady of his dreams is already engaged to someone else. Reena has never seen her fiancé and Maddy (madly in love with her) decides to take the advantage of this situation. He steps in impersonating as her fiancé. After a couple of songs and a few dates the two are blissfully in love with each other. The lovebirds' heavenly bliss is broken when the real Mc coy, Reena's fiancé makes an appearance. What's more, to make the matters worse the guy happens to be none other than Maddy's archrival in college Rajeev.