Prem (Salman Khan) has been married to simple-minded Pooja (Esha Deol) for several years. Unknown to Pooja, he has been having affairs on the sly. He would also like his close friend, Kishen (Anil Kapoor) , to have some extra-marital affairs, but Kishen is loyal to his suspicious-minded wife, Kaajal (Lara Dutt), and wouldn't dream of betraying her in any way. Having failed to convince Kishen, Prem hires a prostitute by the name of Bobby (Bipasha Basu) to seduce Kishen and have an affair with him. When Kishen meets Bobby, he is instantly attracted to her and is willing to go ahead with her. But things go terribly wrong, and Kishen must enlist the help of his co-worker, Shekar alias Sunny (Fardeen Khan), to help him out of the mess. Kishen dupes Kaajal into believing that Bobby is Sunny's wife. On the contrary Sunny tricks his wife Sanjana (Celina Jaitley) into believing that Bobby is Kishen's wife. For Pooja, Bobby is an unknown devil while for Prem she is the trump card.