Three friends—Bhavesh (Shreyas Talpade), Parag (Javed Jaffrey), and Pariksheet (Ashish Chaudhary)—live in Pattaya as paying guests in a house owned by Kiska Miglani (Asrani). Bhavesh works as a chef in a restaurant called Namaste India, owned by Ballu Singh (Johnny Lever). Ballu has a younger brother, Ronnie (Chunky Pandey), who wants ownership of the restaurant because he owes a considerable amount of money to a gangster, Murli (Inder Kumar). Parag is a screenwriter for a television channel, and Parikshit is a car salesman working for Aarti Gupta (Neha Dhupia). Eventually all three of them lose their jobs. The three friends are later joined by Jayesh (Vatsal Seth) from Mumbai, who is a cousin of Parikshit's, and tells them that an apartment is included if he gets a job at an architecture firm. After getting drunk celebrating Jayesh's arrival, they privately insult Kiska, who arrives back home unexpectedly, hears what they are saying, and kicks them out. They go out in search of a place to stay, and a friend of Parikshit's suggests paid lodgings. Parikshit and Jayesh go to the home to find its owner is Ballu Singh, to whom they are oblivious of the fact that he is Bhavesh's former employer. Ballu and his wife, Sweety (Delnaaz Paul), agree to let them stay on one condition: they must be married.
Parag poses as Jayesh's wife, Kareena Kapoor, and Bhavesh as Karishma Kapoor, Parikshit's wife. Jayesh gets the job and will get the allotment to the flat in fifteen days' time. Ballu Singh and Sweety leave to pick up Sweety's sister, Kalpana (Celina Jaitly). When they arrive home, Jayesh's girlfriend, Arpita (Riya Sen), arrives with them and sees the four friends having (what she believes is) sex. She is instantly outraged at Jayesh and leaves him. Meanwhile, Parag seeks permission to marry Seema from her father (Kanwarjit Paintal), and Bhavesh, while wooing Kalpana, finds himself in a situation where Ronnie tries to rape Karishma Kapoor, and in the process of saving Bhavesh, Jayesh nearly drowns him by accident.
While discussing the event with Parag and Parikshit, he discovers the apple he has been eating has half a worm in it. Sweety hears Bhavesh vomit and mistakes him for someone being pregnant. In the meantime, Kanwarjit Paintal has agreed that Parag can marry Seema, Aarti has fallen for Parikshit, Kalpana has chosen Bhavesh as her life partner, and Jayesh has reconciled with Arpita. The four friends decide that it is time for them to tell Ballu and Sweety the truth. In a shopping centre, an accomplice of Ronnie's sees them and tells Ronnie.