Chori Chori Chupke Chupke is a 2001 Hindi movie directed by the successful pair Abbas-Mustan. It stars Salman Khan, Rani Mukerji and Preity Zinta. Chori Chori Chupke Chupke is possibly the first Bollywood movie to handle the taboo issue of surrogate childbirth.
Many of the scenes in the film have been borrowed from Pretty Woman  and the movie is considered a remake of Doosri Dulhan by Lekh Tandon.
In 2001, the CBI [Central Bureau of Investigation] seized prints of Chori Chori Chupke Chupke, after it was discovered the movie was funded by the Mumbai underworld, which has resulted in a well publicised controversy known as The Bharat Shah Case.
Raj Malhotra [Salman Khan] and Priya [Rani Mukerji] are members of high society. They meet, get married and soon Priya falls pregnant. Soon after, Priya trips over a flowerpot and becomes infertile. The couple conceal this fact [through the advice of the doctor], and decide to secretly look for a surrogate mother to bear Rajs child. Raj comes across Madhubala aka Madhu [Preity Zinta], who is a prostitute and agrees to have Rajs baby - she is only doing it for the money. Raj conceals the fact that Madhu is a prostitute from Priya. After some much needed grooming, Madhu meets Priya and they all leave for Switzerland together to carry out their plan.
Soon enough Madhu is pregnant with Rajs child, and he happily tells his family that Priya is expecting [though actually she is not]. Madhu is harassed by Rajs business partner who asks her for sexual favours. She is ready to leave the house, upset by the fact that Raj told his friend that she is a prostitute [though he really did not]. It takes Priya in order to convince Madhu not to leave, she also happens to hear about Madhus profession but she feels that Madhu is still the right girl for their problem. Rajs business partner ends up assaulting Madhu whilst she is in the house alone, however Raj saves her. His kindness overwhelms her and she falls in love with him.
Rajs family unexpectedly end up coming to Switzerland. Their sudden arrival means that Priya has to fake her pregnancy so they use a pillow to make it look as if she is pregnant. The family also meet the heavily pregnant Madhu. Raj manages to convince the family that Madhus husband has left her in his care. Rajs grandfather [Amrish Puri] arranges a religious ceremony and tells Raj and Priya that they are going back to India; this also includes Madhu.
The ceremony is very important so Priya instead sends Madhu as herself as she is the one carrying the baby. The emotion at the ceremony is too much for her and Madhu cannot bear the fact that she will have to give up her child. Priya finds Madhus room empty, with the money dumped on the bed and pursues her to the train station. Madhu tells Priya that she loves Raj, this angers Priya and she slaps her. Raj ends up at the train station, and sees that Madhu has gone into an early labour. The doctor announces that only one of the two can be saved - Madhu or her child. Priya asks the doctor to save Madhu. To everybodys joy both the baby and Madhu are saved and she gives her child to Priya. Priya quickly lays down in her fake hospital room and the doctors bring "her" baby and while Madhu comes and visits, the doctor tells the family that "her" child had died as soon as she gave birth.
Madhu decides to leave and promises Raj that she will not go back to her old profession. When he takes her to the airport he realizes that she loved him and kisses her on the forehead. Madhu leaves happily able to carry on with her life.
Source : Chori Chori Chupke Chupke Wiki Page