Season 5 begins with Sonja hosting a party to introduce three new cast members—Aviva Drescher, Carole Radziwill and Heather Thomson. But the successful bash takes a dramatically downward turn when Ramona arrives and revelations come to light.

LuAnn and Ramona try to mend their relationship, but accusations and denials complicate matters. Meanwhile, gossip and chatter upset Ramona, and dramas swirl around Sonja at an awards event.

Carole throws a brunch in her hip neighborhood; Sonja sets out to launch a catering company; Heather invites some of the gang to tag along on her business trip to London.

Ramona plans a lunch gathering to discuss her issues. Sonja is invited, but she instead opts to have a secret meeting with LuAnn. Meanwhile, Sonja hosts a party, but cracks begins to show in her friendship with Ramona.

Plans for Heather's London trip spin into motion, but Aviva grows concerned that Ramona will be excluded. Ramona and Heather meet to table their differences, but things sour quickly—and Ramona leaves without a London invitation. Meanwhile, Sonja is enlisted to plan an anniversary party for Aviva.

Carole, Sonja, LuAnn and Heather bask in a trip to England. The ladies stay at a well-appointed penthouse and later have a slumber party, where they bond, play games—and dish on Ramona. In New York, Ramona and Aviva shop for shoes.

A London getaway winds down with a game of croquet and a battle royal heating up between Carole and LuAnn. Back in the Big Apple, Aviva throws her anniversary party, where she ends up taking a tumble down stairs in front of everyone.

Four of the ladies discuss a London trip and an anniversary party; Sonja works on her brand; LuAnn hosts a wine event, where Ramona's wine undergoes a blind taste test; Aviva plans a trip to Miami; and disturbing news about LuAnn comes to the fore.

The ladies have a dinner get-together in Miami with Sonja and her date—who happens to be Aviva's lusty father. Later, Aviva seeks advice on how to deal with Ramona, and Carole calls out LuAnn about a past misdeed.

Ramona invites all the ladies—except for Heather—to a dinner, but the heat is on when LuAnn slights Carole. Elsewhere, LuAnn throws a holiday party, where a boozy Sonja squares off against LuAnn and the ladies get up on stage to sing.

Carole throws a holiday bash, and Aviva's libidinous father is among the partygoers. Elsewhere, Sonja arrives at her photo shoot an hour late, irking Heather; Carole completes her book and invites the ladies on an island getaway to celebrate.

Aviva throws a charity event to benefit children in need of prosthetics—but tensions rise when both Ramona and Sonja are no-shows. Elsewhere, Aviva's fear of flying could keep her from attending Carole's trip to St. Barts.

The ladies land in St. Barts—sans Aviva, whose phobias keep her home. The wives delight in their high-level villa and take in a night that features tequila shots, a pirate-theme performance and flirtations with their sightly liaison.

An island getaway continues with a party at the ladies' villa, but only two guests make appearances. Later, the wives take in a yachting adventure; and Aviva heads to St. Barts despite her fear of flying.

The ladies' vacation continues, yet Ramona frets that it's turning into a couple's retreat. On the final night, Sonja and Ramona spark tension when they duck out on the wives' original plans to see a concert.

The wives return from their vacation, but fallout from the trip creates dramas. Elsewhere, a surprise awaits Carole when she crosses paths with a former suitor.

Aviva's father returns and visits a health-food store with his daughter; Sonja negotiates a settlement with her former husband; and Heather preps for her fashion show and has a surprise request for Aviva.

Social events spin out of control in the Season 5 finale. Here, Ramona is seemingly at the center of showdowns, including Heather's fund-raiser (Ramona vs. Sonja) and Carole's book party (Ramona vs. Heather, plus Ramona vs. Aviva).

Part 1 of 2. Andy Cohen hosts a reunion edition featuring the Big Apple ladies.

Conclusion. Andy Cohen hosts a reunion featuring the regrouped New York ladies. Topics include Season 5's confrontations.

Previously unseen footage from "The Real Housewives of New York City" includes the ladies' business ventures, vacation dramas, snippets of the wives speaking in "baby talk," and the discovery of a prosthetic leg.

Heather hosts her own birthday bash in the Season 6 opener. Also: Aviva tries to make amends with Ramona; and the ladies are introduced to Heather's friend, Kristen Taekman.

Aviva lands a book deal for her memoir and enlists Carole for help, but their lunch quickly turns awkward when discussing the issue of ghostwriters. Elsewhere, Sonja has dinner with Aviva's former husband; and Aviva hosts a housewarming gathering.

A fiery fight between Carole and Aviva impacts a party, shocking all attendees. Elsewhere, Ramona tries to accept that her daughter is growing up, and Kristen is pressured to participate in a demanding mud run.

The ladies journey to the Hamptons to see Sonja perform in a burlesque act for charity. Elsewhere, LuAnn returns to host a Hamptons barbecue, but a fiery argument erupts.

Battles continue at LuAnn's barbecue. Elsewhere, Sonja tries to clear the bitter air by hosting a brunch; Carole receives an honor at a Coney Island parade, spurring the other ladies to strut the boardwalk dressed as seagoing drag queens; and Aviva faces her greatest fear.

Ramona returns from Africa with renewed inner peace and tries to bring the feuding Heather and Aviva together; Kristen and Carole meet up with Beverly Hills housewives Brandi Glanville and Yolanda H. Foster; and Heather hosts an anniversary party.

The Fourth of July in the Hamptons leads to interpersonal fireworks. Here, Kristen and Ramona clash; Ramona and Sonja butt heads; and tensions boil over at a clambake when Aviva approaches Carole to settle differences.

Ramona reveals Sonja's financial secrets. Elsewhere, Kristen visits a new modeling agent; Sonja is stood up by her 23-year-old flame; and the heat is on at a spa when Kristen and Ramona have a dispute.

Kristen worries about Sonja's business plan and enlists her business-minded husband to analyze it. Meanwhile, Carole meets with a matchmaker; and Heather invites all the ladies, except Aviva, to her vacation home, where Ramona stirs up tension.

Heather tries to bring peace to the clashing Kristen and Ramona with a dinner. Meanwhile, the ladies take a hike in the woods, but Ramona stirs up tension when she faces a childhood fear; and the women relax, sunbathe, swim and flirt.

The ladies confront Ramona about past behavior. Elsewhere, marital dissension plagues Kristen; LuAnn invites Carole on a double date; and Ramona sets out to make peace with Kristen.

Sonja reaches out to a spiritual healer. Meanwhile, Kristen auditions for a workout video; Aviva's father returns with a surprise; and the ladies assemble for a memorial for Sonja's dog.

Aviva's father delivers shocking news to his 25-year-old girlfriend, and LuAnn hosts a weekend getaway of horse racing and partying, leading to rising drama when Sonja celebrates a little too much.

A Saratoga trip ends with a wives-gone-wild night on the town. Later, Ramona bonds with Avery before her college departure; Sonja's facialist spreads gossip to Kristen; LuAnn throws a charity auction; and Aviva hosts an art party.

The ladies head to Montana, where they take part in a cattle drive. Later, there are beefs at dinner when LuAnn and Sonja clash over gossip spread by a facialist.

A Montana trip continues with tensions lingering between Sonja and LuAnn. Meanwhile, the ladies participate in outdoor activities and a modern-day treasure hunt, but the group divides thanks to a tiff between Heather and Kristen.

Heather and Kristen continue to clash, forcing some of the women to take sides. Elsewhere, the ladies take in a rodeo show and a final outdoor Montana dinner.

The wives return from Montana as Aviva discovers she's been the butt of jokes. Meanwhile, Ramona's husband prepares for an open-mic gig. Heather and LuAnn are also slated to perform, but drama soars when LuAnn backs out.

Carole hosts a lavish party to celebrate her birthday. Sonja is presented with a present from Aviva's ex-husband Harry.

Sonja has a confrontation with Harry and LuAnn. Aviva makes her return to the group, which causes insults and accusations to be thrown around between the ladies.

Part 1 of 3. The Big Apple ladies gather for a reunion hosted by Andy Cohen. Included: Ramona is cornered about her behavior toward Kristen in Montana; Aviva addresses her use of foul language in front of children; and Carole confronts Sonja about rumors and gossip.

Part 2 of 3. The details of the "Bookgate" feud unravel; Ramona explains her dislike of the Berkshires; Luanne confronts Sonja; Andy asks Ramona about the state of her marriage; LuAnn retaliates against Ramona.

Heather and Aviva butt heads; Kristen stands her ground when Ramona tries dismissing her; Ramona and Sonja defend their relationship; the ladies discuss the incident at Le Cirque.