The ladies kick off an explosive 11th season with an epic boat party as Vicki fights to win the ladies back after a year of lies left her friendless and alone. Heather's mansion is still a work in progress, and so is her relationship with her husband Terry. Shannon's marriage is on more solid footing, so it's time to look for a new home. Meghan starts in vitro fertilization (IVF) with no help from husband Jimmy. And new housewife Kelly Dodd brings her big personality to the party, but her mouth gets her in trouble.
While Heather travels to Turks and Caicos to help Terry reconnect with their kids, Tamra tries to save Ryan and Sarah's relationship. Meanwhile, Kelly decides to befriend Vicki against Meghan's warnings. As Shannon continues to rebuild her relationship with David, Vicki does the same with her business. Later, Meghan invites the ladies over to her new house to demolish her kitchen; however it's Kelly who seems to smash her chances of friendship with the girls when she reveals she has befriended Vicki.
Vicki and Briana drive cross country as Vicki finally gets her wish - her baby is moving back home. They encounter major bumps in the road, though, and the homecoming is not all that Vicki hoped. New housewife Kelly Dodd makes as nice as she can with the other ladies, while Meghan is struck out by hormones as she begins IVF. Heather struggles with her childrens' expectations about how much they see their father and shows up solo to a beach party Kelly throws to get to know all the women better. Vicki and Tamra pull their heads out of the sand to try and resolve the ...
Vicki and Shannon have a chilly face-off about the fate of their friendship. Meghan meets Jimmy's frozen sperm for the first time as the couple moves one step closer to starting their family. Heather laments how Terry's schedule is jeopardizing their family and Meghan advises Kelly to keep quiet when it comes to her opinions on Vicki. Shannon enlists Tamra's help in making a tough decision regarding Vicki.
At Shannon's 70's-themed party, she gets into a heated argument with Kelly about her rumor-filled past. While Vicki juggles work, babysitting her grandsons and nursing Briana back to health, she still finds time to "whoop it up" with the ladies, at least the ones who are speaking to her. Heather confronts Terry about his lazy parenting after he schedules a work trip for Mother's Day. Tamra tries to help Kelly mend fences, but winds up stirring the pot instead.
In the wake of all hell breaking loose at Shannon's 70's party, Shannon tries a new remedy to remove toxins. Kelly tries to make amends by inviting Shannon to sit down and rehash the night. Tamra explores custom bikinis for her fitness competition and Vicki tours Briana's new house in the midst of renovations.
While Vicki revels in the return of her family to Orange County, Heather strives to find a work/life balance on the eve of her book launch. Kelly struggles to figure out Shannon's motive for setting her up and bonds with Vicki over their shared anger. Tamra plans a last hurrah for Meghan before she gets pregnant, but the sushi party goes off the rails when Kelly loses her cool and crosses a line.
After an explosive night at the sushi dinner, Heather and Tamra discuss Kelly's volatile behavior as Kelly regretfully turns to her friend Meghan and receives some tough love. Meanwhile, Meghan takes the next crucial step in her IVF process. Later, Shannon celebrates a night full of surprises with all her friends and family. Back in the OC, Vicki and Kelly have a party of their own and bond over being the odd women out.
While Shannon heads to Cabo with David, Tamra and Kelly join Vicki at the Merv Griffin estate to celebrate Vicki and Brianaâ€ôs upcoming birthdays. Heather and Terry enjoy a date night dinner where they discuss his busy schedule and her problems with Kelly. Later, Tamra arranges a meeting between Kelly and Heather to work out their differences.
Tamra, Vicki, Heather and Kelly travel to Glamis to celebrate Eddie's birthday. After a long RV ride down, the ladies finally get to see what the motor sports mecca has to offer. The next day, the ladies explore the dunes, leading to a ride they will never forget. Meanwhile back in Orange County, lives are forever changed as Meghan receives the results from her pregnancy test and Shannonâ€ôs holistic home has finally sold.
As the women recover from the accident in Glamis, Tamra returns intent on carrying on with the trip. New alliances form in the wake of Meghan and Shannon's refusal to visit Vicki at the hospital. Back in the OC, Tamra contemplates postponing her fitness competition. While Meghan goes to Vicki's house to make amends, Shannon attempts to get back into her friends' good graces.
Shannon panics about her families' impending move, while Vicki celebrates Briana's birthday and makes it clear she is ready to fill up her love tank. The ladies help Shannon purge her outdated closet; however tensions run high over unresolved issues between Shannon and Kelly, as well as Tamra and Meghan. Friends and family gather to watch the Beador girls perform, but Shannon's night is rocked by a shocking allegation from an uninvited guest.
Michael and Kelly discuss the ups and downs of their relationship since separating, while Meghan goes to her first ultra sound appointment. Shannon packs up her old home and gives it a heartfelt "goodbye" while Tamra hosts Kelly, Vicki, and Heather for a day of pampering. Unfortunately, things at the spa aren't as tranquil as expected when Kelly opens up about her rocky marriage.
Meghan throws a party to celebrate the grand opening of her candle store. Vicki threatens to expose a secret about Shannon that leaves all the ladies confused. As Kelly and Michael try to navigate their tumultuous marriage, Meghan and Jimmy try to get a handle on her pregnancy. Meanwhile, Heather throws a party to celebrate the release of her book; where Vicki and Shannon finally confront one another.
The ladies jet off to Ireland to explore Meghan's heritage. On a pub crawl, an over indulgence of spirits leads to an exchange of words between Tamra and Kelly, ultimately pushing Tamra over the edge. With Kelly on the outs, the rest of the ladies try to salvage their first day in Ireland by enjoying a traditional Irish Hooley Night.
After a bumpy start, the women head off on separate adventures. Meghan takes Kelly to nearby village in an attempt to locate distant relatives, while Vicki, Tamra, Heather and Shannon travel to a milk farm. The two groups reconvene for dinner where Kelly tries to make amends with Tamra. However, tensions reemerge and bombs fly when the ladies make their way back to the airport, leaving this group of friends in disarray like never before.
The Ireland trip ends with the conclusion of the bus ride from hell. Back in Orange County, the women try to make sense of their war on foreign soil. Tamra is finally ready to flaunt her body on stage at her long awaited fitness competition.
The ladies gather together at Shannon's new house to celebrate Tamra's victory at the fitness competition. However, with the residual anger surrounding Vicki's gossip, Tamra, Heather and Shannon decide it's time to shut down the rumor mill. They finally confront Vicki.
Kelly faces the music for her behavior this season and reveals some shocking secrets about her past. Heather goes head-to-head with Kelly about her outbursts at the sushi party, while Shannon talks about her vow renewal and rocky relationship with her mother-in-law. Vicki's daughter Briana visits the couch.