In the Season 4 finale, Morgan and Brendan get into a fight as the threat of rain hangs over their wedding day. Wondering whether she's ready for married life, the bride-to-be travels to NYC with EJ just days before the big event. Meanwhile, Dorothy and Bianca's relationship troubles come to a head at Jonny's birthday.
Dorothy has second thoughts about being a bridesmaid for Morgan after hearing what Morgan allegedly said about her. Unable to keep mum about it, Dorothy chooses Morgan's bachelorette party in Miami to confront the bride-to-be, who then ends up in a blowout with Bianca.
While on his bachelor party in Cabo San Lucas, Mexico, Brendan confides in Jonny and struggles with Morgan's decision to write a book revealing her wild past. Elsewhere, EJ wonders if a career in fashion means a move to New York City; and Dorothy's world is turned upside-down when Bianca reveals that Morgan isn't the friend Dorothy thought she was.
Morgan's career interferes with her wedding planning duties when she is granted the opportunity to meet with a bestselling author in New York City. Back in Los Angeles, EJ throws a glitzy launch party for his signature nail polish shade, while Brendan worries that the stories Morgan is writing in her book might be too scandalous.
Morgan and Brendan learn that their wedding date may be doomed; EJ decides to create his own business empire while also giving back to the LGBT community; Dorothy takes everyone to Las Vegas to celebrate her birthday; and Bianca's diva behavior gets her in trouble.
Dorothy helps EJ find love by "hunting" for eligible men on the streets of Rodeo Drive; Morgan apologizes for her bridezilla ways, but new issues arise as she and Brendan realize they aren't on the same page financially; Bianca lets Dorothy and Jonny in on a little secret about a family fallout between her and Brendan, which infuriates Morgan leading to a showdown at Jonny's first DJ event.
Morgan chooses her bridal party. Even though Dorothy makes the cut, she decides to bail on wedding activities and jet off to NYC with Bianca instead. Meanwhile, EJ enters the dating scene by taking a tantra class and having a live streaming pillow talk on Periscope; and Jonny pursues his dream of becoming a DJ.
Season 4 begins with preparations for Morgan's wedding creating even more drama with Brendan. Meanwhile, Dorothy turns to a new friend for advice dealing with boyfriend trouble; EJ gets his own place in L.A. and tries to figure out what he wants to do with his life; and a health scare rocks Jonny's world.