Prem (Salman Khan) is a Love Guru who solves the love issues of his clients. He meets Bhaskar Diwakar Chaudhary (Govinda) who comes to Prem for help in his love life. Bhaskar loves his boss Priya Jaisingh (Katrina Kaif) but is unable to express his love to her as she is the daughter of a wealthy businessman. Prem initially refuses to help Bhaskar and goes to Phuket, Thailand. Bhaskar follows him there and convinces him to help.

After returning from Thailand, Prem meets Naina (Lara Dutta), a photo journalist who was running from some gangsters led by Chhota Don (Rajpal Yadav), who mimicks Shahrukh Khan in Don. Prem saves her and falls in love with her. Meanwhile, he starts teaching Bhaskar how to impress Priya. But Bhaskar uses his own simplicity and nonsense acts to impress Priya. Priya finally falls in love with Bhaskar but does not disclose it to him.

Prem comes to know from Bhaskar that Priya is getting married to someone according to her father's will. They both come to Priya's wedding ceremony with Naina, and Priya's father is convinced by Bhaskar's acts. Priya now gets ready to marry Bhaskar.

Meanwhile, a spoiled brat named Neil comes to Prem for love help and he asks Prem to convince a girl to have a one-night stand. Prem gets angry with Neil and tells him that he does not help people with such bad intentions. Neil somehow manages to get his one-night stand and then ditches her, telling her the love guru gave him advice to do so. Unfortunately, the girl turns out to be Naina's friend Nikki. Naina then sets out to expose the Love Guru and finds out that it is Prem. Naina hates Prem for what she thought he did to her friend and publishes a front page article claiming that Prem can set anyone up with the girl they want using the Priya/Bhaskar relationship as an example.

Prem thinks that Bhaskar may commit suicide without Priya and goes to her to tell her what really happened. Priya realizes that all the things she liked about Bhaskar are what Prem wanted Bhaskar to hide from her and Priya is ready to take Bhaskar back. Prem makes up with Naina by making her hear the truth about him not helping Neil, and they get back together. On both couples' honeymoon night, Bhaskar again asks Prem for help but this time they both get mingled with their respective wives.

Rahul (Sharman Joshi) is a young man with dreams, working as a call center executive in a BPO in Mumbai. He silently loves Neha (Kangna Ranaut), a smart young woman who has made it up the ranks in a very short time, due to her relationship with her boss, Ranjeet (Kay Kay Menon).

In his 30s, Ranjeet is married to Shikha (Shilpa Shetty) and has a six-year-old daughter. Shikha is well educated, and a trained dancer. Ranjeet and Shikha decided that she should stay back at home and take care of the house and their child. Their eight-year marriage has turned loveless and bitter.

Neglected by an indifferent husband and bogged down by family chores, Shikha is attracted to maverick Akash (Shiney Ahuja). Akash is a struggling theater artist who is separated from his wife. Akash and Shikha's relationship starts as friendship and almost blossoms romantically, until Shikha feels guilty and cannot cross the limits that she has so fervently guarded all these years.

Amol (Dharmendra) is a 70-year-old man who has returned to India after 40 years to spend his last few years with his first love, Shivani (Nafisa Ali), who is also Shikha's former dance teacher.

Shikha's sister and Neha's roommate Shruti (Konkona Sen Sharma) works in at Radio Mirchi as a producer. She is 28 and desperate to get married. She meets Monty (Irrfan Khan, in an award-winning comedy role) through a matrimonial site, but she is unimpressed by the straightforward and socially inept Monty. While Monty likes her and is ready to marry her, she declines when she finds him ogling her. She is, however, dreamy-eyed about her RJ, Rishi K. Her boss hooks her up with Rishi K, and her relationship with him blossoms.

Rahul has a novel strategy to rise up the ladder of success. He provides his flat to his superiors at the office, where they can safely bring their mistresses, girlfriends or prostitutes, in return for recommendation for his promotion. Ranjeet also uses the flat to meet Neha.

Amidst one of their escapades in Rahul's flat, Neha asks Ranjeet about their future, which leads to an argument. He insults her and leaves. Indignant, she attempts suicide. Rahul finds her lying unconscious, and saves her. He brings her back to his house, which brings them closer.

Shruti is heartbroken when she discovers that Rishi K is gay. She leaves the job and gets a new one where she again meets Monty. Slowly, they become friends. Meanwhile, Shruti comes to know about Ranjeet and Neha. Ranjeet panics and confesses to Shikha of his two-year affair with Neha. An already guilt-stricken Shikha cannot hold it in any longer and tells him about her emotional relationship with Akash. Ranjeet is shocked and angry, and decides to leave his wife.

Shivani dies. Amol regrets the decision to leave Shivani 40 years back, stressing the importance of love to Shikha and Shruti. Shruti realizes that she loves Monty and tells him so just as he is about to go for his wedding. Meanwhile Akash decides to leave the country and asks Shikha to join him. On the other hand, Rahul is disillusioned with the way the metro has treated him and decides to resign and leave the city. Neha realizes that Rahul really loves her and follows him to the station. Ranjeet returns to Shikha, who is just about to leave for the station to see Akash.

Neha chases Rahul. Monty chases Shruti. Shikha comes to the station but not to accompany Akash. She wishes him good luck, tells him that she will miss him.

While the credits roll, we are shown Akash still roaming the streets of Mumbai, Shikha and Ranjeet are in a happier marriage, and Rahul is living happily with Neha. Shruti and Monty are also happily married and have a kid.

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Uday (Nana Patekar), a criminal don, takes it upon himself to get his kindhearted sister, Sanjana (Katrina Kaif) married, but he is unsuccessful since no one wants to be associated with a crime family. Dr. Ghunghroo (Paresh Rawal) has also been trying to get his nephew, Rajiv (Akshay Kumar), married but due to his condition—the alliance must be with a purely decent family—he is also unsuccessful.

When Rajiv jumps into a burning building to save Sanjana, he is smitten by her. Uday and Majnu (Anil Kapoor), Uday's friend gangster hatch a plan for an alliance with Dr. Ghunghroo. The plan works and Dr. Ghunghroo confirms the alliance, thinking that Uday is a very decent man. But when he is later told that Uday and Majnu are mobsters, he quickly takes his family and flees to Sun City, South Africa to escape. However, Majnu and Sanjana have come to Sun City as well. Rajiv meets Sanjana again and the two fall in love.

Dr. Ghunghroo reconciles with Uday and Majnu and finally agrees to the alliance. Uday and Majnu invite a powerful don of the underworld, RDX (Feroz Khan) to the engagement. At the party, a girl named Ishika (Malika Sherawat) arrives, claiming to be Rajiv's childhood betrothed. Ishika is actually the sister-in-law of Dr.Ghunghroo that Dr. Ghunghroo asked to come and try to break off the engagement. Ishika manages to do so, leaving Rajiv and Sanjana heartbroken. Dr. Ghunghroo reveals that he did this for Rajiv's mother, who had married into a crime family and was harassed and tortured, thus telling Dr. Ghunghroo to raise Rajiv away from crime when he was born. Dr. Ghunghroo decides he will agree to the marriage only if Uday and Majnu give up their life of crime. Rajiv and Sanjana do this by reawakening Uday's love for acting and encouraging Majnu to pursue his love for painting. With these things keeping them busy, Uday and Majnu have no time for crime any more.

Rajiv's actions anger RDX's son, Lucky, who attempts to shoot Rajiv. Sanjana gets hold of the gun and fires a shot that hits Lucky, causing him to go unconscious. RDX is informed of his son's death and comes to attend the cremation. However Lucky, who is still alive, escapes, trying to show his father that he's actually alive. RDX sets the pile of wood on fire, believing he is cremating his son's body. However Lucky, who had been hiding under the wood, jumps out upon realising the wood is on fire, and the truth is revealed to RDX. Rajiv, Ghunghroo, his wife, Ishika, Uday, Majnu and Sanjana are captured by RDX and brought to a cabin set next to a cliff. The frightened group is forced to play "Hot Potato" with a globe—but the one who ends up with the globe must jump off the cliff. When Rajiv refuses to pass the globe to Sanjana, Lucky angrily yanks it out of his hands, just as the music stops. Now that his son has the globe, RDX figures the only way he can maintain his image is by killing everyone. Before he can, several government brokers sneak up and cut the footings of the cabin, causing the house to start falling over the cliff, with everyone trapped inside. However, the cabin is suspended by only one column. Hilarious chaos ensues as the group tries to balance the cabin together and keep it from falling off the cliff. Rajiv finds a rope and the group uses it to get back onto stable ground. But to everyone's shock, the floor broke and Lucky was hanging on the edge of the cabin. While Rajiv is trying to rescue him, Sanjana reveal the truth to everyone that she was the one who shot Lucky, but Rajiv blamed himself so that Sanjana won't get in trouble. After Rajiv rescued Lucky, the cabin he is standing on fell off a cliff. Sanjana kept crying for him thinking he is dead. However, Rajiv survived the event and is reunited with Sanjana and his family. Lucky and RDX are grateful to Rajiv for saving their lives and RDX gives up his life of crime, allowing Rajiv and Sanjana to finally get married.

Indian-born Manmohan Malhotra (Rishi Kapoor) re-located to London, England, established himself, returned to India, got married to Bebo (Nina Wadia), and after four years got a visa for her so that she could live with him. Shortly thereafter, she gave birth to Jasmeet (Katrina Kaif). Manmohan was always embarrassed by Bebo as she was fat and could not speak English. As a result, he always left her out of important occasions, while he socialised. Bebo did not want Jasmeet to end up like her, so she got her educated in an English school, encouraged to mingle with British friends, and Jasmeet was transformed into Jazz – a beautiful young woman, modern in looks, talk, habits, and heart.

Her father had set her to meet a young lad, Bobby Bedi (Ritesh Deshmukh), though the date turns out to be a disaster and Bobby rejects her. Manmohan thinks that it is impossible to get him an Indian son-in-law, although his friend, Parvez Khan (Javed Sheikh), is in a similar situation with his son, Imran (Upen Patel), who has a blonde girlfriend, Susan (Tiffany Mulheron). Manmohan takes his family for a tour in India and forces Jasmeet to marry Arjun Singh (Akshay Kumar).

On their return to London, Jasmeet announces that she is getting married to Charlie Brown (Clive Standen), who is well educated and has good friends and connections, even with Prince Charles. She refuses to recognise her marriage with Arjun as there is no proof of the wedding. When Jasmeet is introduced to the friends of the Brown family, she is subjected to considerable racist abuse (snake charmers, Indian rope tricks, tandoori chicken) as well as a quote from Winston Churchill: 'When we leave India, the country will be in the hands of goons'. During this period, Jazz becomes close with Arjun who still supports her. Charlie Brown then has a rugby match against the Indians and Arjun, the English lose and Brown is verbally racist to the Indians. Imran is then asked by Susan's parents to leave Islam, become a Christian, change his name to Emmanuel or Ian, as well as provide written proof that his family is not associated with terrorists. The film ends on a happy note when Imran decides not to be a Christian and Susan is accepted by Imran's family; Jazz realises her love for Arjun, runs away from her wedding to Charlie Brown, and goes with Arjun back to India where they are seen riding Arjun's motorcycle. While they are on the motorcycle Arjun reveals that all along he knew how to speak English.

Directed by	Shimit Amin
Produced by	Aditya Chopra
Written by	Jaideep Sahni
Starring	Shah Rukh Khan
Music by	Salim-Sulaiman
Cinematography	Sudeep Chatterjee
Edited by	Amitabh Shukla
Distributed by	Yash Raj Films
Release dates	11 August 2007
Running time	153 minutes
Country	India
Language	Hindi English
Budget	240 million(US$3.8 million)
Box office	1.05 billion(US$16 million)

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Rajveer Singh (Saif Ali Khan) has an immense passion for stock car racing and dreams of making it big on the racecourse. After being discovered by his manager Harry (Jaaved Jaffrey), he meets Radhika Shekar Rai Banerjee (Rani Mukerji) and instantly falls for her. He joins Speeding Saddles, a failing race team, and transforms from Rajveer Singh to RV the race car driver. He wins his first race and keeps winning, making him quite wealthy.

What started as an innocent love blossoms into a serious relationship as months pass. Radhika is a great pianist, majoring in music at Columbia University, whereas Rajveer has no degree or any education background. His lack of education and planning earns the disapproval of Radhika's father, Subho Shekar Rai Banerjee (Victor Banerjee). Radhika leaves her father and marries RV. She forgets about her degree and takes on her job as a wealthy housewife: Radhika Shekar Rai Banerjee turns into Shona. Their family is complete with the birth of two beautiful children, Shanaya aka Princess (Angelina Idnani) and Pradeep aka Champ (Ali Haji). Luck follows RV and he is soon proclaimed the number one race car driver in the USA.

Tragedy strikes when RV is involved in an accident whilst racing and he is hospitalised for a few months. When he gets out, he heads straight to the track to race again but soon learns that he's scared of going fast because he doesn't want to crash and get hurt again. Every race he joins, he ends up in last place. His manager fires RV and finds someone else. RV tells Harry that he doesn't need him, he can find some other manager easily.

A year has gone by and neither RV nor Shonaa have jobs. They try their best to find work but no one will hire them because they don't have degrees. RV and Shonaa are unable to pay their loans and bills so everything they own in their house is sold. Princess and Champ worry that they're becoming poor; RV says they're actually on a reality show, Don't Worry, Be Happy. With about $2,000 left, RV and family leave their big house and find a less expensive one.

They move into a one-bedroom apartment, and the children become worried again. RV and Shonaa tell them this is all part of the game and the kids believe them. They still go to their favorite school while their parents try to find jobs.

A few days later, Shonaa gets a job as a piano player and RV becomes a taxi driver.

One night when RV and Shonaa start arguing, Princess overhears them and learns that they actually are in trouble with money. She then plans to save up the money she and Champ use for lunch. The kids don't eat, and Champ gets starved. He takes food from the garbage without his sister knowing and eats it outside of school on a bench. He keeps eating from the garbage while Princess keeps saving up money. Princess makes Champ promise not to tell their parents, knowing they'll get mad.

RV gets a customer who needs to get to the airport soon. He takes this chance as to test his racing skills. RV starts off doing great until he gets flashback on his accident. He then learns that he could probably never race again because of being scared of getting hurt.

Champ gets a piece of glass inside his stomach from eating something. RV, Shona, and Princess run to the hospital where Princess tells her parents the plan she made Champ follow. The doctor tell RV and Shonaa that they need $65,000. The couple has no idea how they are going to get the money and only have two days to get it. RV decides to enter a race for his son's sake. He meets his old nemesis and he starts remembering the flashbacks. But that doesn't stop him. He wins, while apparently killing his nemesis by pushing him off the track. In the end the family is living a happy and fun life.