A remake of the 2010 Argentine comedy Igualita a mí, the film stars Khan and debutante Alaya Furniturewala in the lead roles and explores the story of Jazz, a property broker and party-animal in London, who has to confront a daughter he never knew he had, who is also pregnant.

Jaswinder "Jazz" Singh (Saif Ali Khan) is a 40-year-old carefree womaniser who works in London as a property broker during the day with his brother Dimpy (Kumud Mishra) and parties at night in a bar owned by his friend Rajendra "Rocky" Sharma (Chunky Pandey), usually taking whichever girl agrees to go to his home for a one-night stand.

Jazz, along with Dimpy, has to negotiate a multi-million-pound deal involving a property in Hounslow, but his aged landlady Mallika Zaid (Kamlesh Gill) refuses to part with her home due to an old tree, and his repeated attempts to convince her to give it up for the new construction do not succeed.

His reckless partying ways continue at personal expense, as once he falls from a bar table, drunk, and breaks his leg.

Ananya and Rohan's hippie, drug-fuelled, wanton ways are too much for Jazz to handle, and he fears that this may impact Tia's delivery.

A despondent Jazz ponders over whether the deal is really worth aggrieving an old lady, before he finally decides to call off the Hounslow project, even at the expense of money, to which Dimpy agrees.

He then rushes to the Waterloo railway station where the three are waiting for their train; he proceeds to tell how he cancelled the deal and saved Mallika's tree, when Tia's water breaks suddenly.

The film ends with Rhea and Rocky joining the Singh family at Jazz's parents' home for Diwali celebrations.

Saif Ali Khan started a new production houses laa in October 2018 to co-produce Jawaani Jaaneman with Jay Shewakramani.