Kate is Walden's ex-girlfriend and main love interest of Season 10.
Walden decides he wants to come up with a new persona so he can meet a girl that isn't after his money. Walden pretends to be the make believe Sam Wilson. Walden and Kate meet at the department store she works at. Walden and Kate go on a few dates and Kate meets Alan, "Sam's" landlord and she hates him. Kate tells Walden that he can move in with her and he agrees. They also spend Christmas together. Walden has Alan invest in Kate's fashion line with Walden's money and Kate goes to New York to host her fashion show. Walden feels depressed with Kate gone and he gains a lot of weight. Alan helps Walden lose it and they fly to New York so Walden can tell Kate who he is. Kate gets furious and breaks up with him but later realizes that Walden helped her get her fashion show so she forgives him but they don't get together since Kate has to stay in New York. Kate returns three episodes later and Walden spends Valentine's Day with her. They are forced to break up due to their busy schedules. It is revealed that Walden's ex-girlfriend, Rose is Kate's new fashion line investor.
- "One Nut Johnson"
- "Give Santa a Tail-Hole"
- "Welcome to Alancrest"
- "Grab A Feather And Get In Line"
- "Advantage: Fat, Flying Baby"
- "West Side Story"
- "Lan Mao Shi Zai Wuding Shang"