Carrie and Big buy an apartment and plan to get married. They don't.
The four girls go on the honeymoon to Mexico together. Life goes on.
Carrie buys back her apartment, hires an assistant, and redecorates while writing a new book.
Miranda breaks up with Steve but they reunite and they have a sex life again.
Samantha gains 15 pounds, buys a pillow humping dog and watches her neighbor have the sex life she wants, so she leaves Smith and returns to NY.
Charlotte gets pregnant and has a girl named Rose.
Carrie gets back with Big and they get married after she reads his love e-letters.
The movie ends with the girls celebrating Samantha's 50th birthday with a night on the town.