Vicki expands her business and moves offices; Tamra reunites with an old friend; Shannon struggles with her weight and her marriage; Kelly worries her mother is becoming a hermit; Meghan returns after the birth of her baby, Aspen.
Shannon enlists a feng shui expert to help bring balance to her chaotic life; Lydia launches her magazine; Kelly struggles to make her marriage work; Meghan settles into life as a new mother; Lydia and Shannon meet for the first time.
Vicki struggles with trust issues as she sets up her new office; Peggy and her family deal with her upcoming surgery; Tamra resumes her role as the "Rodney King" of the OC; Shannon contends with her weight gain as well as her nemesis Kelly Dodd.
Shannon takes Sophie out for a driving lesson; Kelly seeks to improve her love life from the inside out; Lydia's mother throws a birthday party for her grandson; Tamra hopes to break the cycle of parental alienation and divorce in her family.
Tamra and Shannon come fact to face with Meghan's new baby; Lydia's family takes a vacation full of uncomfortable conversations; Vicki meddles in her son's love life; Peggy invites her friends to the unveiling of her Lamborghini.
Vicki tries to balance her life alongside her relationship with Steve; Lydia plans a launch party for her new magazine; Tamra organizes a sit down for Kelly and Shannon; Megan hosts a Sip-N-See for baby Aspen.
Lydia is hopeful everyone can get along for her magazine's launch party; Tamra struggles with the scars of her broken family; Tamra thinks Peggy is overstepping her bounds, and things end up not so noble at the Nobleman launch party.
Vicki turns green with envy after learning that Kelly is celebrating St. Patrick's Day with Shannon and Meghan; Lydia wonders if her son's prophecy will come true as she competes in a race; Meghan, Shannon and Kelly indulge in whiskey and whimsy.
Kelly suspects Shannon of being up to her old tricks; Meghan investigates Vicki's issues with Shannon and Tamra; the women attend a Drag Bingo event, during which Lydia faces a moral dilemma; Kelly and Meghan tear into old wounds.
Meghan continues to reel from Kelly's attack; Tamra gets an unexpected phone call; Peggy prepares to send her daughters off to college; Shannon celebrates her birthday; details from Eddie's past are revealed.
Kelly is having breast reduction surgery and decides to have a Boobs Voyage Party with all of the women except for former best friend Meghan; all hell breaks loose at Kelly's party when Tamra and Vicki finally talk face to face.
Kelly undergoes breast reduction surgery; Tamra shares her concern over Shannon's behavior; Vicki and Shannon visit Kelly while she recovers; Peggy fends off digs from Kelly; Lydia discovers Shannon failed to invite her to dinner.
In spite of her hurt feelings, Lydia invites everyone to Doug's party; David questions Diko about her health; Shannon asks her mother for advice about her marriage; Vicki decides to meet with Tamra to end their feud once and for all.
Vicki and Tamra meet face-to-face; Lydia discovers the joy of getting richer; Kelley discovers parallels between her parent's relationship and her own; Peggy and Diko celebrate their wedding anniversary; Shannon faces consequences.
Lydia and Doug plan an Iceland trip, and Doug urges Lydia to invite her friends at Meghan's dinner party; Peggy confronts Shannon about David, causing all hell to break loose; Shannon confesses to Tamra about the current state of her marriage.
The women explore everything in Iceland, from hiking a glacier to sampling the exotic cuisine; Tamra and Vicki reconnect, while Lydia and Tamra hit a bump in their friendship; the ladies are faced with a shocking medical emergency.
As Vicki's health scare continues, Peggy shows a side to her personality that shocks the others; later, a broken friendship may be mended, while a drunken night causes fractures in another.
Peggy reveals a secret video to Lydia; the women whoop it up at a Viking dinner; Tamra and Vicki continue to get along, much to Shannon's dismay; Peggy strikes out at Meghan; Shannon discovers her marriage is on thin ice.
Tamra attends her estranged daughter's high school graduation; the ladies celebrate the launch of Meghan's new candle line.
The ladies reunite; Lydia is taken to task for her outspoken opinions and actions; Vicki provides an update on her relationship with Steve; Kelly and Shannon open up about the state of their marriages.