Big tells Carrie that he's leaving his wife. Miranda deals with her breakup and Steve moving out of the apartment. After meeting the MacDougal family matriarch, Charlotte maneuvers Trey into making an "alrighty" proposal. Samantha is upset when dating a hot guy with "funky spunk".

Carrie feels guilty and wants to quit her affair with Big. Miranda enjoys phone sex with a co-worker from Chicago. Charlotte negotiates the terms of her prenuptial agreement with Trey's mother, Bunny. After celebrating her move to the new apartment in the exclusive Meatpacking District, Samantha's bout of the 'flu gives her a pessimistic outlook on life.

Carrie struggles to find the right time to tell Aidan about her affair. Miranda tells a guy she's a stewardess in hopes of getting a date. Charlotte has her dream wedding and marries Trey MacDougal—even after attempted late-night tryst reveals Trey's serious shortcomings. Cunning linguist Samantha sleeps with Trey's Scottish cousin, despite being unable to understand him.

Carrie decides, after a broad-daylight Manolo mugging, that she must clear herself of bad karma and decides she needs to talk with Natasha about her affair with Big. Miranda dates a gorgeous NYPD detective and becomes self-conscious about her own looks. Unhappily-married Charlotte struggles with her lust for a hunky gardener; she and Trey decide to separate. Samantha meets another Sam Jones, who turns out to be an NYU student and desperate virgin.

Carrie gets an invitation to the opening of Steve—and Aidan's—new bar, Scout. Miranda thinks she has a ghost in her apartment. Charlotte butts heads with Trey's mother, Bunny, when redecorating their apartment. Samantha's girlfriend Maria gets fed up with the many, many men from Samantha's past.

Carrie is dragged to Aidan's country home in Suffern, New York. Charlotte visits the MacDougal "compound" in Connecticut. Miranda yells at Steve when he tells her he has testicular cancer but has no clue about his condition. Samantha gets annoyed when her dates keep asking her what she's doing "next weekend".

Aidan proposes to Carrie. Charlotte discusses adoption with Trey, but hits a wall when Bunny finds out that the baby could be Chinese. Miranda tells Steve she's having his baby. Samantha starts sleeping with her boss, Richard Wright.

Carrie is shocked to find out that Big is moving to Napa, California and plans to give him a New York send-off. Charlotte begins dating another recent divorcé. Miranda prepares for the new baby as her delivery date nears. Samantha suspects Richard may be cheating on her.

Carrie invites Jack Berger to her book opening party, which turns out to be a huge event. Charlotte butts heads with Bunny MacDougal. Miranda's single life and her life with Brady conflict. Samantha gets an impulse-buy chemical peel that goes awry.

Carrie deals with her past with Aidan when she runs into Nina Katz, who had dated Aidan after he and Carrie split up. Charlotte gets a tough lawyer to go up against Bunny in a fight to keep her apartment. Miranda has no one to turn to when she needs help taking care of Brady. Samantha tries to return a spent vibrator, then spends some of her free time on Miranda.