Life Partner is the story of friends, who struggle on the marital marathon, but on different tracks. Three friends, three different approaches to life is Life Partner in a nutshell.
Karan (Fardeen Khan) and Sanjana (Genelia D’Souza) are madly in love with each other. And for them, marriage seems to be the next step to cement their relationship. But is 'love marriage' the right way? Is marriage the extension of the bond between them, on a social platform? Does marriage have to be the end of everything that they cherished in the relationship before they got married? These and some more questions form the basis of the start of their life together.
For Bhavesh (Tusshar Kapoor), his family comes first and matters the most. And his life-partner, Prachi (Prachi Desai) also comes with his family's approval. But is arranged marriage the right? Is it right to prioritize the family first even after marriage? Does Prachi have to prove herself as a worthy daughter-in-law to be an ideal wife? These and some more questions form their married life.
Jeet (Govinda) is a divorce lawyer extraordinaire and doesn't believe in the institution of marriage. He can't be monogamous and is sometimes responsible for his clients' divorce and ends up fighting their cases too. But is 'no marriage' the right approach? Will Jeet ever find someone? Will his views on marriage ever change?
How they manage to cope up with their life after marriage, and whether or not they succeed in their respective endeavors forms the crux of the plot of Life Partner.