The dysfunctional family of the Mehras which consists of Kamal Mehra (Anil Kapoor) who is not just a self made successful businessman, but also a self proclaimed one at that! His wife is Neelam Mehra (Shefali Shah) whose life is all about wicked, sarcastic and tongue-in-cheek one-liners. Despite having a million differences with each other, they pretend to the world that they are the 'best couple', only because their whole world revolves around the worry of 'log kya kahengey'.
The Mehras have a daughter Ayesha Mehra (Priyanka Chopra), who is not just the 'inheritor' of acute business acumen, but also is a successful entrepreneur and the owner of an extremely successful online travel portal. Her success can be gauged by the acknowledgement given to her by the 'Forbes' magazine. Then there is the 25 year old carefree dude Kabir Mehra (Ranveer Singh), who is in charge of spearheading the once-successful-now-struggling AYKA industries. But the fact of the matter is that, while his heart lies in flying (he owns a private plane), he was thrusted the family business by his 'strategically planning' parents.
The Mehra family will be totally incomplete without the mention of their family dog cum family member named Pluto Mehra (voiceover by Aamir Khan). Bitter reality strikes the Mehra family when they get to know that their company AYKA is not just running into losses, but also is losing its credentials and integrity from the market. Around the same time, a big celebration is being planned in the lavish 'Pullmantur Sovereign Valleta' cruise liner for Kamal and Neelam Mehra in lieu of their 30th wedding anniversary. Being firm opportunists, Kamal and Neelam grab this opportunity with both their hands and convert this event into a matchmaking event between Kabir Mehra and Noori Sood (Ridhima Sud), the only daughter of Lalit Sood (Parmeet Sethi).
The Mehras firmly believe that if their 'plan' works out, then, AYKA can be easily bailed out of financial losses by the 'Mr. Moneybags' Lalit. But, what happens on the cruise is out of anyone's imagination. While Kabir falls madly in love with the London based 'Muslim' artiste Farah Ali (Anushka Sharma), Ayesha realizes that she cannot pretend to love her dominating and egoistic husband Manav (Rahul Bose) because she finds her true love in the journalist Sunny Gill (Farhan Akhtar). Besides this, there are many other dirty linens that gets washed in public. Do the Mehras become successful in their plan of saving AYKA by marrying off their son to the rich Soods, does Kabir marry Farah Ali or Sood's only daughter Noorie, does Ayesha come out of the unsuccessful marriage and what 'role' does Pluto Mehra play in the whole family drama is what forms the rest of the film.