Big make a rather arbitrary decision to get married. The wedding itself proves to be anything but a hasty affair--the guest list quickly blooms from 75 to guests, and Carrie's simple, label-less wedding gown gives way to an enormous creation that makes her look like a gigantic cream puff.
An upcoming photo spread in Vogue puts the event--which will take place at the New York Public Library--squarely in the public eye. At least, they couldn't be happier for Carrie. Charlotte still has the unrealized hope of getting pregnant. Samantha is finding a loving, committed relationship more grueling than she could have imagined.
Miranda unwittingly lets her own unhappiness--created when Steve admits to cheating on her just once--spoil Carrie's. After a heated encounter with Steve, she happens to spot Mr. Big and tells him he's crazy to get married. She's really only thinking of her own marriage. But her angry remark gets Mr. Big professed his love to Carrie and three books by Carrie on their life later, focus on the other "L": Charlotte believes she has the perfect love life with husband Harry Goldenblatt and their adopted two year old daughter Lily.
She is hyper-vigilant in ensuring that that life remains perfect especially in light of some unexpected news on the home front. This revelation is even more troubling to her with a handsome new neighbor moving in next door, he who always seems to be having sex with a different woman every night. Miranda and her bartender husband Steve Brady are facing problems maintaining a healthy sex life as Miranda focuses her attentions on caring for their five year old son, Brady Hobbes.
This and a subsequent action by Steve places a strain on their love life and marriage. And Carrie and Big make the decision to buy an apartment together. The lavish apartment they choose and the subsequent financial arrangement they embark upon lead to Carrie and Big deciding to get married. Combined with a request by Vogue editor Enid Frick to Carrie, Carrie and Big come to individual views as to the emotional toll on each other of their decision, which is complicated by a statement by Miranda.
A result is that Carrie, for the first time, hires a personal assistant, a young woman named Louise from St. Louis who unwittingly helps Carrie come to grips with her personal problems. Through the trials and tribulations of the four in dealing with their respective love lives, they, as always, lend their emotional support to the other three.
Big and Carrie buy a magnificent penthouse in Manhattan and they decide to get married. Enid Frick invites Carrie to take pictures for a special edition of Vogue about marriage of women of forty and something years. During the preparation, Carrie raises the guest list from seventy-five to two hundred guests, and a simple wedding dress to a fashionable Vivienne Westwood, intimidating Mr.
Big in his third wedding. Meanwhile Miranda has no sex with Steve and he confesses that he had had one night stand with a woman. On the eve of the wedding, in the rehearsal dinner, the upset Miranda tells Mr. Big that marriage ruins everything.
On the next day, the scared Mr. Big calls off the wedding leaving Carrie in the church. Carrie feels humiliated and depressed and Samantha, Miranda and Charlotte decide to travel to Mexico with Carrie to the hotel where she was supposed to spend her honeymoon. When Carries returns, she hires the assistant Louise to help her to organize her life. When Miranda discloses what she told to Mr. Big to Carrie in the rehearsal dinner, their friendship is shaken.