Luann catches Dorinda up on how her wedding plans are unfolding. Dorinda complains about Sonja's persistent bad mouthing of her. Bethenny and her realtor friend Fredrik get to work to sell the apartment she got back in the divorce. Carole has made some changes to her living situation. Luann confronts Ramona about Tom.

Former “it girl” Tinsley Mortimer, has just moved back to the city after a tumultuous few years, including getting arrested, and is the latest boarder in Sonja’s townhouse. Bethenny invites Carole and Ramona over to discuss life, politics and Sonja’s new roommate’s tragic fall from the heights of the NYC social scene. Ramona fills Dorinda in on the dirt she has about Tom, Luann’s fiancé. Sonja throws a Mad Hatter tea party to introduce everyone, except Dorinda, to Tinsley.

The ladies head to the Hamptons for a weekend of fun and an early birthday dinner at Ramona’s. Carole is staying at Bethenny’s and the only thing she can talk about is the election. Splitting her weekend between Luann’s and Ramona’s homes, Dorinda prepares to see Sonja for the first time since learning about the gossip she has been spreading about her for months . Ramona takes the wrong approach with Bethenny when asking about her film role from 20 years ago.

Ramona’s Hampton’s dinner party continues and barely into the salad, Dorinda takes the conversation to a new level when she confronts Sonja about her incessant trash talking. Carole disinvites Ramona from her Election Night party because she doesn’t believe Ramona is taking the presidential election seriously enough. Tinsley gets drinks with Luann and Dorinda, but leaves out her roommate Sonja.

Carole and her mom go canvassing in Pennsylvania in the last moments before the presidential election, and later Carole and her friends watch the results come in while at her party. Sonja is conflicted between “Frenchie” and Rocco. Dorinda conspires to get Ramona to a surprise party she’s throwing for her, but Ramona unknowingly throws a wrench in the plans.

Carole attends the memorial service Dorinda has for her husband, Richard, who died five years ago. Bethenny considers upgrading to a larger apartment. Tensions between Sonja and Tinsley are on the rise as Sonja blames her for everything wrong in the townhouse, forcing Tinsley to think about moving into her own place. Dorinda and the other bridesmaids get a sneak peek at Luann’s wedding dress. Over group drinks, Ramona first questions Luann about not being invited to her wedding and then decides to confront Bethenny yet again.

Ramona gets advice about her situation with Bethenny; Tinsley, Ramona and Sonja hit the Upper East Side for a night out; Tinsley meets a young suitor; Bethenny meets Luann's fiancé, while Carole learns there may be trouble in paradise.

Bethenny discusses selling her apartment with broker Fredrik Eklund ("Million Dollar Listing New York"). Also: New rumors fly about Luann's fiancé; Tinsley's mom visits; and Dorinda hosts a birthday-holiday weekend for the ladies at her Berkshire home

The ladies join Dorinda to tell Luann about rumors regarding Tom. Meanwhile, Ramona's odd behavior at dinner throws everyone off, and conflict between Bethenny and Ramona reaches new heights.

A fight in the Berkshires between Bethenny and Ramona reaches an explosive level. In the Big Apple, Luann and Tom host a pre-wedding lunch with Dorinda and old pals Jill and Bobby Zarin. Also: Luann and Tom head to Palm Beach for their wedding.

Bethenny hosts her annual holiday party, but Ramona’s not invited. Ramona gets advice on her situation with Bethenny from her daughter Avery and Avery’s friends. Luann and Tom get married in Palm Beach on New Year’s Eve. Tinsley learns that "Frenchie" has moved into Sonja’s townhouse. Newlyweds Luann and Tom host a NYC reception for the friends not invited to the wedding.

Sonja’s love triangle gets more complicated as things heat up with "Frenchie." Meanwhile, Tinsley goes apartment hunting. Carole and Adam bicker over items he left behind in her apartment. Fredrik and Bethenny look over her apartment as they plan to put it on the market. Carole and Dorinda go to Washington DC for the Women’s March. Ramona throws a party at her apartment with a surprising guest list.

An old-school skirmish erupts between Dorinda and Sonja during a lunch in the Bronx. Tinsley breaks down during therapy. The ladies head to Vermont for a snowy weekend, despite tension between Ramona and Bethenny. Tinsley's life decisions are discussed.

Sonja digs a deeper grave for herself with Luann. While the ladies hit the slopes, a big news story about Bethenny breaks out online. Bethenny is on the fence about inviting Ramona to Mexico. At dinner, the ladies play a revealing game of "Truth or Dare” and Dorinda ends up attacking Luann.

Bethenny fine tunes the upcoming trip to Mexico; Carole has her day in court; Sonja gets an intimate cosmetic treatment; Bethenny is forced to face Ramona at Dorinda's dinner party; Tinsley practices her flirting on a blind date set up by Carole

The ladies arrive in Mexico, with Ramona and Sonja scrambling for the best villa room and swiftly alienating themselves. Tinsley addresses a damaging article about her. Luann takes a boozy tumble. Bethenny reprimands Sonja for her bad behavior.

It’s a new day in Mexico and the drama continues as Bethenny confronts Ramona about attending the Tequila trip. Tinsley readdresses the press article with Sonja, while some of the other ladies try their hand at surfing. The ladies all go shopping together and Ramona tries to buy her way back into Bethenny’s good graces. Tinsley and Sonja’s tension resurfaces at dinner. Bethenny takes the ladies on an educational day-drinking trip to the agave fields in Tequila. The ladies ride the drunk train back to the villa where Sonja puts Ramona in the hot seat.

Fresh off of their day trip to Tequila, the ladies drink up and strip down back at the villa. Sonja spreads the love to all the ladies while Bethenny and Ramona have a nude detente in the pool. Dorinda and Bethenny get into a fight that leads to knives flying. Some of the ladies split off for a day of fishing and whale watching. At their final dinner Luann flubs the rules of a game.

After moving out of Sonja’s townhouse, Tinsley has Carole over to see her new digs. Luann and Tom challenge each other during a game of tennis. Bethenny deals with the stresses of renovating a new apartment, but finds distraction with a hot, new fling. Dorinda has John over for a romantic dinner, while Sonja and Frenchie talk about their upcoming trip to France together. The ladies all come together when Tinsley throws a thank you party for Sonja.

Dorinda confronts Sonja over the "Tipsy Girl" allegations; Luann gives an update on her first few months of marriage; Bethenny questions Ramona's attitude toward others; the housewives speculate on Ramona's behavior; Andy Cohen hosts.

In part II of the reunion, new housewife Tinsley opens up about her rocky re-entry into NYC life and reveals some big news. Carole reflects on the turbulent election and the status of her relationship with Adam, while Sonja discusses her personal love triangle, which elicits a shocking accusation about her French lover. Additionally, Bethenny gets emotional talking about her personal life and how she is planning to move forward.

The reunion concludes when the housewives look back on their fun-filled trip to Mexico, from Lu’s tipsy topple to the tequila-drinking marathon. Tinsley and Sonja attempt to clear the air and salvage their friendship. However, the reunion takes a turn when Bethenny questions the sincerity of Ramona’s tearful apology. In the hot seat, Ramona is forced to address the accusations she made against Bethenny this season.

The ladies of New York are back after an eventful summer. Newly divorced Luann sits down with Dorinda and starts to open up about her relationship with Tom. Meanwhile, Bethenny mourns an unexpected death in the family. Typically reluctant to exercise, Carole preps to run the New York City Marathon. All the ladies reunite when Dorinda throws an epic Halloween party that nobody will forget.

Sonja makes hurtful accusations about Tinsley’s finances. Meanwhile, Dorinda attempts to improve her friendship with Sonja. Carole runs the New York City Marathon after months of training, but with a surprising omission in her cheering section.

The ladies head to the Hamptons for a fun-filled weekend. Tensions rise between best friends Carole and Bethenny. Dorinda and Sonja's friendship is short-lived, as a blowup at Luann's brunch sets their relationship back.

Tensions boil over between Dorinda and Sonja at Luann’s brunch; at Ramona’s dinner party, Tinsley delivers a low blow to Sonja that shocks the whole party; Sonja calls out Ramona for not being a true friend in a text message.

Back in New York City, Tinsley gets a surprise delivery; Carole and Luann talk through the miscommunications that have been plaguing their friendship; Luann runs into Tom's old fling; a shouting match erupts between Sonja and Ramona.

Carole reveals shocking news about her relationship with Adam; Sonja prepares her townhouse; at an important business dinner in Miami with Bethenny's relief team, Dorinda jeopardizes her chances of going to Puerto Rico.

Bethenny and Dorinda hit the ground in Puerto Rico and get to work. Ramona attempts to mend fences with Sonja. Carole works on a revealing story with a magazine, while Luann starts to plan a special performance. Bethenny lets Dorinda in on an incident involving Carole’s ex, Adam. Carole confronts Bethenny about an accusation she’s made that puts Ramona in the middle of their friendship.

It's time for the ladies to make their annual visit to the Berkshires. Carole confides in Dorinda and Ramona about some tension with Bethenny, which puts Dorinda in an uncomfortable place. All of the ladies get decked out for a 1920's murder mystery dinner party taking place at Blue Stone Manor, but it's an argument between Carole and Bethenny's that has the ladies guessing whodonnit?

Carole and Bethenny continue to hash out their issues during the murder mystery dinner party. Back in the city, Bethenny's holiday party is interrupted by a surprise, which leads to hurt feelings. At Luann's blood drive, Carole is upset when she finds out that Bethenny has been talking about her behind her back. Then, Ramona confronts Bethenny on an epic sidewalk phone call. In a shocking turn of events, Luann gets arrested over the holiday.

Two weeks after Luann's surprising arrest, she is still the talk of the town. While she's in rehab in Palm Beach, the ladies try to piece together what happened. Bethenny throws a launch party for her new jeans line, and later meets Carole for lunch to try and resolve their dispute. Sonja flees her construction site and spends a night with Tinsley. Dorinda takes the initiative to check-in on Luann in rehab.

Tinsley tries on wedding dresses with her mother, Dale. While Luann is ending her stint in rehab, the women tough it out during a prison style workout. A few of the ladies attend the funeral for Bobby Zarin, and Bethenny and Jill Zarin share an intimate moment after the funeral, for the first time in years. Luann heads home after her month in rehab.

Luann gets out of rehab and the ladies whisk her away for a spa weekend in Connecticut; the relaxation doesn't last long as Luann discovers that Ramona tried to get an invite to Tom's New Year's Eve party; Dorinda and Sonja clash over a family crest.

Luann deals with the unwanted press. Dorinda confronts Bethenny the lingering tension.

Dorinda brings Luann to pick out dresses from one of her designer connections so she can prepare for her upcoming cabaret show; Bethenny creates a dating profile for Sonja; Tinsley moves into her new penthouse without Scott’s help; the women attend a speed-dating event in New York City; and the ladies decide to go on a trip to Cartagena, Colombia, as they want to escape a chilly winter.

The women arrive in Cartegena, Colombia, for their vacation; Bethenny has an allergic reaction; Luann reveals a shocking new look; an injured Ramona gets wheeled around the cobblestone streets. Bethenny clashes with Dorinda and Carole.

As the ladies head out for a day of shopping in Cartegena, Bethenny continues to unravel and the women’s patience with her begins to run out. Carole approaches Sonja for insight on Bethenny. Later over dinner, Tinsley, Ramona, and Sonja try to not eavesdrop on a heated conversation between the two distant friends. A comment Luann makes to Dorinda sends Dorinda off the deep end and puts their friendship on the rocks.

Tensions arise at breakfast as Luann and Dorinda continue their argument from the night before, as do Carole and Bethenny; the ladies ditch the city for a private island and some fun in the sun, despite the strained relations; and the day ends abruptly with a traumatic boat ride after the ladies are rushed off the island due to high seas.

Ramona shows off her newly renovated Hamptons home; Sonja stands firm on the asking price for her townhouse; Bethenny invites Dorinda to her new apartment; Adam shows up bearing gifts at Carole's athletic-chic Cosmopolitan Magazine party.

It's the night of Luann's cabaret show, #CountessandFriends. Over pre-cabaret drinks, Dorinda, Carole, and Tinsley go over some shocking guest list faux paus on the Countess's part. During the performance, Luann gets heckled, and Sonja shows some skin. At the after party, Ramona has a burning question for Bethenny and Dorinda has some parting words for Luann.

With one glaring exception, the Housewives gather to relive fun times from season 10; the women pay tribute to Bobby Zarin while questioning Bethenny's motives; they take a look back at some of their questionable wardrobe choices.

Dorinda defends herself against accusations that she may have a drinking problem; the ladies discuss Luann's absence; Tinsley reveals startling details about her relationship with Scott; Bethenny and Carole call each other out over comments.

Bethenny and Carole continuing to go shot for shot about the dissolution of their friendship; the women relive their stomach-churning trip to Colombia; Carole revisits the highs and lows of her season; Tinsley takes issue with Carole’s protests about their relationship; Sonja discusses a new chapter in her life and delves back into her issues with some of the ladies; and the women end things by sharing their biggest regrets of the season.