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.

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.

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.

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 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.

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.

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.

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.

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

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.

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.

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.

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.

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.

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.

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.

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.