Dee Dee's cousin Barbara comes to town for Big Dee Dee's baby shower, and stays with Mona because there is no room at Dee Dee's place. Mona is furious to learn from Barbara that Dee Dee shared things that Mona had told her in confidence about the effect her mother's bitterness has had on her feelings about marriage. Mona gives Dee Dee the silent treatment, but later has a talk with Phyllis about her fears. Big Dee Dee dreads the shower because she knows the guests will insist on touching her belly. Meanwhile, Spencer gets a makeover from Adam and some friends in the hopes of impressing Camille's social crowd.

Mona tries to find time alone with Nick, but her mother and Dee Dee can't seem to get the message. Dee Dee's longtime friend Aurora comes for a visit. She was once extremely obese, but has now experienced a dramatic weight loss, thanks to a gastric bypass surgery. She is not used to having men pay attention to her, and Dee Dee worries about the fact that she seems to overreact whenever someone pays her a compliment. Meanwhile, Spencer tries to get over his break-up with Camille by hooking up with virtually every woman in the Bay Area. Dee Dee tries to keep him away from Aurora, as she believes she could get hurt. Adam is upset when everyone begins to bail out of his big ""28th"" (or 27th, 26th, 25th or 23rd) birthday bash in Las Vegas. Spencer and Aurora wake up naked and hung over in a Vegas hotel room, and Adam tells them they got married. A panicked Dee Dee, unable to find Aurora, interrupts Mona's romantic weekend with Nick. They learn what has happened to Spencer and Aurora