Kirsten Cohen

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Kirsten is the eldest daughter of real estate developer Caleb Nichol and older sister of Hailey Nichol, and married husband Sandy Cohen sometime during her rebellious twenties (she states that when they fell in love she "lived in a mail truck and stank of patchouli"). Since marrying Sandy and giving birth to their son Seth, Kirsten joined her father at the Newport Group, becoming somewhat of a workaholic. Unlike her husband, Kirsten Cohen is conservative.

During the first season, Kirsten had to deal with suddenly having another child, Ryan Atwood. The problems began for her during the second season when she feared that her husband was cheating on her with an old girlfriend. Sandy and Kirsten's marriage began to deteriorate, and she turned to alcohol to compensate. Her alcoholism was fueled by working closely with a man whom she had a crush on, who also drank too much. Toward the end of the second season, she crashed her car while driving drunk and caused a scene at her father's funeral. Following an intervention, she was checked into a rehabilitation program.

There, she met Charlotte Morgan, a con artist who claimed to be interested in her, but in reality was only after her for money. She has since returned home to Newport and is now in the process of creating a high-class dating service with Julie Cooper.