Mann Kapoor (Emraan Hashmi), a wannable singer, is a hard-core opportunist. The term hard core suggests the nature of a man to put his head before heart while grabbing an opportunity. Mann therefore does not hesitate in "choosing" Radha (Hrishitaa Bhatt) as his love interest for a purely selfish cause. The secret lies in Radha being the daughter of Umesh Jumani (Tiku Talsania), a very successful music company owner. Umesh Jumani who is reminded of his own days of struggle by Radha, dares not to refuse the proposal.
An agreement for Mann's music album is signed and marriage with the daughter of the business tycoon is planned. This is a big enough reason to justify the demand by Mann's friends for a treat in Goa.
Along with these three friends it's trouble that lands up in Goa. Little does Mann visualize that his involvement with the Goa beauty, Roma (Celina Jaitley), intended to be a one-night stand would land him in trouble meant for a whole life span. The very day Mann is caught red handed sharing the bed with Roma; he is forced into wedlock with her. The person responsible for this being the underworld don, Chappu Bhai (Mahesh Manjrekar), a silent lover of Roma. Roma's words which Chappu clearly remembers justifies his act "The only person to touch me would be the one in whom I would see a partner for life."
Roma, who's had a soft corner for Mann, ever since she had seen him, stand true to these words. She cherishes the company of her husband and respects the bondage of the wedlock, even if it had been a forced one. However what the marriage reflects for Mann is his ruined career and shattered dreams. Only a miracle could get him out of this mess, is what he believes. Roma proves to be one. Despite herself she frees from a relation, that had never been accepted by him. Divorced Mann, released from a cage flies down to Mumbai where Radha and more important Stardom awaits him.
Convincing Radha, who is genuinely in love with him, and who actually desires to be convinced, is not really difficult. Jumani who seems to be living for and because of his daughter cannot afford a different stand. Marriage is re-arranged, date re-planned.
Roma re-enters the life of Mann, though now only in professional terms. She is the chosen model and a co-star of Mann by Umesh Jumani, for his video. Passing days of the shoot make Mann realize his growing concern and possessiveness towards Roma. He realizes that it is for the first time that he is truly in love and he is surprised to realize that he could give up his career for love.
But, Roma, a woman who prioritizes heart over head, wouldn't let him do that. Nor would she allow the dreams of some other woman be hurt due to her. She walks out of Mann's life for the second time.
Marriage between Mann and Radha, scheduled after two months is pre-poned to an hour's time by a shocked Radha who learns about his fiancÉs with Roma. What a helpless Mann can do about this decision of hers is simply nod in an O.K.
Mann who has by now surrendered himself to his fate, is over awed as his destiny takes a third twist. The film is a beautiful blend of deep emotion's and dramatic twists.
Who does Mann choose to be his life- partner?
Does he put his love or career on the line?
Will he be able to make the right decision?
Whose heart will he end up breaking?
Watch Jawani Diwani to know the answers. With a young cast, amazing music, sex and comedy, this film promises to start your new year with a bang.