After the previous "fattest housewife" in Westport gets plastic surgery to lose weight, Chloe Brown Mueller rubs it in Katie's face that Katie has now assumed that title. In order to get revenge on Chloe, Katie goes through great lengths to dig up bad photos of Chloe from high school. In discussing body image with the kids, Katie and her mother, Kathryn, turn out to be bad influences on Anna-Kat and Taylor, unintentionally encouraging them to focus too much on the outward appearance. Over time, Katie realizes how judgmental she has become and that she is part of the problem.
Katie Otto, a confident, unapologetic wife and mother of three, raises her flawed family in the wealthy town of Westport, Connecticut, filled with "perfect" mommies and their "perfect" offspring. Katie's perfectly imperfect world is upended when her neighbor's decision to move notches her up from her ideal social standing and sets her on a path to ensure that doesn't happen, regardless of the consequences. She lets us in on her deepest, most unfiltered thoughts through voiceover as the she lives her life as the second fattest housewife in Westport.