Prems [Ranbir Kapoor] fundas in life were very simple - be happy, make others happy. A case of mistaken identity leads Prem to almost kidnap Jenny [Katrina Kaif], who was brought up by indifferent and uncaring foster parents. Prem falls in love with Jenny, but realizes gradually that Jenny is in love with someone else [Upen Patel], the son of a conniving politician [Govind Namdeo]. Prem decides to sacrifice his love and get the lovers married.