A delightful film from the irrepressible David Dhawan who is the acknowledged king of comedy and Vashu Bhagnani the man with the Midas touch.Biwi No 1 is the story of Puja played by Karisma Kapoor and her errant husband Prem (SalmanKhan) whose extra marital affair causes Puja to take matters into her own hands.Puja and Prem fall in love and get married much against the wishes of Puja's parents who are wealthy and dislike their daughter's choice because Prem is poor.But once they were married , Prem's fortunes changed and lady luck followed his meteoric rise to fame and WEALTH.

Prem becomes the head of a large advertising firm and his success is attributed to the love and support of Puja who takes great pride in her husband's success.But the idyllic existence is shattered by the entry of Sushmita Sen who plays the role of Rupali Walia, an ambitious model who has only a single minded goal in life to marry a rich man. As fate would have it Prem hires her to model for his agency,and this is the start of an affair between the two. Rupali uses her feminine wiles to entrap Prem who lies to her that he is a bachelor. Their affair and the need for some privacy takes them to the snow covered peaks of Switzerland where their secret is exposed by Prem and Puja's friends Lakhan (Anil Kapoor) and Lovely(Tabu) who are on the same flight as Prem and Rupali.Lakhan who is the family well wisher pleads with Prem to get rid off Rupali but his request goes unheeded by Prem who is infatuated by Rupali.On their return to India Prem continues to meet Rupali on the sly .Unsuspecting Pooja is still inlove with Prem until Lakhan exposes the truth about Prem's capers.

Puja is shocked and issues an ultimatum to Prem to break off his liaison with Rupali but Prem is unrepentant and leaves home.Pooja is heartbroken and at her wits end until good friend Lakhan comes to the rescue. He advises puja to fight for her rights and for her husband with the same kind of cunning wiles employed by Rupali.This is the start of the actual transformation of Puja from a simple homely girl into a woman who takes her destiny into her own hands.She devises an amazingly simple strategy to win back her husband from the clutches of the other woman. But will she succeed where others have failed?To catch a glimpse of the battle between the two women watch out for BIWI NO 1 .