第 4 季 共 20 集
播出时间：2009年10月17日
第 1 集 The Butterfly Effect (1)
播出时间：2009年10月17日
Betty finds that everything is changing as she begins her new job as associate features editor, especially since her boss is her ex-boyfriend, Matt Hartley, who is still unhappy about their breakup. In addition, Betty's new officemate, Megan, openly resents her, while Marc is constantly undermining her because he felt he was more deserving of the promotion. Meanwhile, without Betty as his assistant, Daniel is adrift, still mourning the loss of his wife, Molly. Betty tries to help Megan out on an assignment and connects with a thoughtful insect jewelry designer, Olivia, while Justin starts high school and is victimized by bullies-but won't tell his mom, Hilda. Claire Meade is finding that her power struggle at the company has her sitting pretty - for the moment -- opposite Wilhemina, who lost her claim to the Meade throne last season. But Wili has perhaps an even bigger problem than job security - she is harboring a secret at home that is driving Marc to distraction.
第 2 集 The Butterfly Effect (2)
播出时间：2009年10月17日
Betty gets to run her own Mode photo shoot at the United Nations to promote their anti-malaria initiative, "Nothing but Nets," but her big opportunity becomes a baptism by fire when Daniel's neediness takes its toll, and Matt openly demoralizes her. Meanwhile, Amanda does some soul-searching when she bonds with Daniel's new temp, Helen, a career receptionist as fabulous as Amanda is. Wili makes it her personal mission to protect a loved one, and Hilda reaches out to Marc to figure out how to help Justin.
第 3 集 Blue On Blue
播出时间：2009年10月24日
Betty tries to get a scoop with Gucci's new designer, Evan York, through Hilda's customer, Sammy. Marc tries to stop her by getting Amanda and Matt to stage a showdown at Ignacio's restaurant. Daniel goes to a bereavement group and meets Natalie who shows him an interesting night. Wilhelmina flies to Bermuda to try and find Connor.
第 4 集 The Weiner, The Bun, and The Boob
播出时间：2009年10月31日
Betty has Marc as be her temporary assistant thanks to Wilhelmina. Betty ends up covering the worst jobs in New York as an assignment but she needs to dress up as a hot dog and perform a Bollywood style dance. Marc has insecurities about how his idol at Vogue magazine will perceive him. Daniel is targeted by the leader of the Community.
第 5 集 Plus None
播出时间：2009年11月7日
At Wilhelmina's fund-raiser for Tibetan orphans Matt asks someone to be his partner. Daniel hires Natalie as his assistant, making Betty feel unneeded. Daniel finds out that Claire has a secret.
第 6 集 Backseat Betty
播出时间：2009年11月14日
Hilda has doubts over her relationship with Archie after seeing an old flame Bobby Talercio. Marc helps Justin to fit in high school by telling him to become friends with some mean girls. Elsewhere Daniel is lured into a trap by Bennett. Wilhemina tries to come up with money to help Nico out of trouble.
第 7 集 Level (7) With Me
播出时间：2009年11月28日
Daniel hands over the power to the Community of the Phoenix to run Mode. Betty steps in to help Daniel with Bennet. She comes up with an cunning plan with the help of Claire. Wilhemina goes out in public wearing sweats creating mayhem with the media trying to get a scoop.
第 8 集 The Bahamas Triangle
播出时间：2009年12月5日
Betty, Matt and Amanda's love triangle in the Bahamas reaches boiling point. Betty has trouble with a photo shoot when Penelope Graybridge steals the shoot from her enemy Wilhemina. Marc falls for super sexy Troy.
第 9 集 Be-Shure
播出时间：2009年12月12日
Ignacio prepares a romantic dinner for his Jean. Betty and Hilda take the Be-Shure instant pregnancy tests. Meanwhile, Hartley gets Denise Ludwig to fill in for Wilhemina. However Marc plans to bring Willie back. Claire with Amanda track down Tyler, the son she gave up for adoption.
第 10 集 The Passion of The Betty
播出时间：2010年1月7日
When Betty becomes concerned that she and Matt are spending too much time together, she tries to give him something else to be passionate about -- a surprise gallery showing of his art work -- with unintended results. Meanwhile, Marc is horrified that his one-night stand, Troy, is falling for him, since Marc was Troy's "first", Hilda grapples with whether or not to tell Bobby that he's the father of her unborn child, and Cal officially replaces Wilhelmina with Denise.
第 11 集 Back in Her Place
播出时间：2010年1月14日
A battered but unbowed Betty recounts her worst week EVER to Mr. Z as the show flashes back to her horrible last few days. Frustrated over the frivolous assignments Wilhelmina gives her at Mode, and inspired by Audrey Hepburn's memoir, Betty creates her own blog about amazing charitable ventures that inspire her. However, as her hobby enriches her, her job is nearly killing her, since Wilhelmina tortures Betty with beauty experiments for future stories. Meanwhile, Daniel fears Marc is sabotaging him -- and he is; Bobby treats a hormonal Hilda to some pampering during "Hilda Week," which goes awry, and Wilhelmina makes a long-term commitment to the incarcerated Connor.
第 12 集 Blackout!
播出时间：2010年1月21日
Betty invites Hilda and Justin to stay for dinner after Justin's acting class audition, but they decline. Living alone in her, Betty realizes that she misses Matt and fears that if something happened to her, no one would know. Though Amanda and Marc live in the same building, they do not want to walk to work with her, increasing her loneliness. Meanwhile, Marc is feeling tension working for both Daniel and Wilhelmina, and sees a career opportunity when he hears the vacant Senior Fashion Editor position will be filled.
第 13 集 Chica and the Man
播出时间：2010年2月4日
Wilhemina is livid when she lays eyes on drag queen impersonator - Wilhediva Hater. Betty and Daniel go through a rough patch as she wins an award for her blog. Daniel has the press hot on his heels. While Marc is pleased with himself when a famous director does a photo shoot with him.
第 14 集 Smokin' Hot
播出时间：2010年2月11日
Daniel helps Betty to cover a low-priority show. Betty discovers a new designer, Marisa, and decides to promote her however she faces stiff competition from Marc. Amanda struggles to persuade Marc or Betty to vouch for her to Wilhemina about her clothing line. Tyler tries to find Claire in New York.
第 15 集 Fire and Nice
播出时间：2010年3月11日
To speed along the investigation into her house fire, Betty is pressured to date an annoying fireman. Wilhemina tries to prove to Don, an old flame from her past, that she's just "Wanda from the block" instead of an uber-bitch, and Amanda draws closer to Tyler, convincing Claire to hire him as an in-house model at Mode. Meanwhile, Hilda meets Bobby's parents for the first time.
第 16 集 All The World's A Stage
播出时间：2010年3月18日
Justin is enjoying his acting class with his eccentric teacher, Lena Korvinka. When Betty thinks there might be a problem with him and his friends, Austin and Lilly, she drops by the class to check up on him. Betty gets sidetracked when a playwright called Zachary is introduced to the class. Betty tells Hilda about Zachary and believes his speech about reinvention was aimed at her.
第 17 集 Million Dollar Smile
播出时间：2010年3月25日
In the episode, Betty Suarez finally has her braces removed, but only after she enters a dream sequence in which she sees what her life would be like if she had had perfect teeth. At the same time, Justin Suarez tries to contact Austin, who he kissed in the previous episode and Daniel Meade secures the Million Dollar Bra for a MODE cover shoot. Meanwhile Amanda Tanen reveals that her relationship with Tyler is getting serious.
第 18 集 London Calling
播出时间：2010年4月1日
Hilda is planning her wedding, which is getting closer and asks Betty about the plans for her bachelorette party. Betty tells her that she's planned a champagne tour of The Met museum, but Hilda and Bobby believe it's a joke and Betty has to think of something else. Bobby is put out when Justin turns down a lift to school in favour of walking with Austin.
第 19 集 The Past Presents the Future
播出时间：2010年4月8日
As Hilda's wedding approaches, Betty asks Daniel to be her guest, Amanda tries to set Marc up with soap opera star Spencer Cannon, Justin wonders whether he can invite Austin, Wilhelmina finds a way to get the Meade empire and Betty gets an unexpected offer in both her personal and professional lives.
第 20 集 Hello Goodbye
播出时间：2010年4月15日
The episode focuses on Betty Suarez struggling to tell her friend and boss, Daniel Meade about her new job in London. At the same time, Betty's sister, Hilda tries to keep their father from finding out she is moving to Manhattan. Wilhelmina Slater recovers from being shot by Tyler and Amanda Tanen finally finds her father.
