In the season premiere, Kourtney and Kim arrive in New York City where they plan on opening their third DASH clothing store. A newly-single Kim is ready to spend some quality time with her sister--but with Kourtney's baby daddy Scott living with them in the same hotel room, Kim may end up exploring New York alone. Meanwhile, Kourtney is impressed by Scott who seems to have his life is back on track--but is he really over his bad boy ways?

A high-end fashion magazine asks Kim to grace their next cover but there's only one problem-- it's a nude shoot. She agrees to do the provocative pictorial--but when she receives the final layout, she isn't happy with the results. Plus, Khloe flies to New York to help Kourtney and Kim with the construction of their new DASH store, and Scott drops the nice guy act and gets in a bar fight. Will Kourtney finally draw the line and kick him to the curb?

Even though Kim promised to enjoy the single life while in New York, she falls back into old her habits when she reconnects with her hunky former bodyguard Shengo. Meanwhile, Scott busts his budget trying to impress his boss--but Kourtney is far from impressed and wants their family to be his top priority. Will his desire to climb the social ladder come at a huge cost?

As Kim prepares to turn 30, she can't help but reflect on her plans to have been married with kids by this age. To help Kim celebrate this birthday milestone, her mom organizes a party in Las Vegas for the family and all of Kim's diehard fans--but there's one person Kris doesn't think should come along. After Scott's outlandish behavior at Kim's party last year, Kris threatens not to show up if Scott decides to attend. Disregarding their mom's wishes, Kim and Kourtney fly to Vegas with Scott, but once they land in Sin City, his actions shock everyone. Plus, Kourtney proves to Kim that life doesn't end when you turn 30.

Kim is devastated to learn that Shengo's visa is expiring, forcing him to go back to Australia. When she realizes that her feelings for her Aussie are stronger than she thought, how far will she go to keep him in the country? Meanwhile, Kourtney and Scott struggle to find privacy in their hotel suite and are forced to seek out alone time elsewhere in the city. But when they get caught during one of their rendezvous, will they regret getting kinky in such public places?

Kim is offered a chance to record her own single with well-known music producer The Dream--but her lack of experience in the music industry may drive her to call it quits before she even hits the recording booth! Meanwhile, Kourtney is annoyed by Scott's new fashion accessory and takes matters into her own hands to make sure that his new toy doesn't become next season's must-have.