Watch Keeping Up with the Kardashians Season 4 in Australia

NBA player Lamar Odom proposes to model Khloé Kardashian; they exchange wedding vows and enjoy their reception.

When Scott goes to Vegas, Kourtney fears he will revert to his old ways; Kylie and Kendall grow annoyed when Kris decides to be more involved in their lives.

Khloe needs professional help to deal with her anger issues toward Scott; Rob ends up in a hospital after unknowingly taking a drug.

Khloe gets excited when she thinks she's pregnant; Kim's tendency to tell little white lies gets her into big trouble.

Kourt issues an ultimatum to Scott when he fails to take her pregnancy seriously; Bruce stands up to Kris, demanding independence after she confiscates his ATM card.

Kim takes in a sickly, stray Chihuahua and is devastated when she must say goodbye; Bruce pressures Rob to move out of the house.

Bruce teaches the Kardashians how to give back by volunteering them for a charity boxing event; Kourtney learns about child rearing by babysitting for friends.

The sisters take a trip to Santa Barbara that forces them to question if they will ever be close again. At home, Kylie gets jealous about Kendall's modelling career.

Khloé makes a `love tape' for her husband, Lamar Odom of the Los Angeles Lakers; Kourtney learns to enjoy sex again while pregnant.

Kourtney ends her relationship with Scott after he gets violently drunk in Las Vegas on Kim's birthday; Kim takes on more work than she should.

After fainting from exhaustion, Kim learns to manage her professional life; Kourt takes Scott back and gives birth to their son, Mason.

Scott returns to the house to apologize to Kris, but she refuses to give him another chance. Worried about never seeing Kourtney again and possibly never meeting his child, he frantically sends text and voice-mail messages until Kourtney grants him a chance to explain himself in person. She finally reconciles with him, and the whole family comes back together at her baby shower. Kim faints from exhaustion and takes 2 weeks off, deciding that when she does resume working, she won't take on so many responsibilities. After Kourtney delivers her son, Mason Dash Disick, she announces that she'll be returning to Miami to hire new girls at the store, as only 2 are currently working there. Khloé says she'll go too although she'd rather stay in L.A. with Lamar; she compromises that she won't be there 24/7. Scott is also going, to visit friends and open a nightclub. Kris is upset that Kourtney and Scott will be taking Mason along, and Bruce tells Khloé her marriage is more important than going to Miami.