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For those unfamiliar with the show:

Lisa Robin Kelly as Laurie Forman (seasons 2–3; recurring, season 1, 5): Eric's beautiful but evil older sister. Laurie enjoys tormenting Eric and manipulating her parents. She is very promiscuous, often seen with different men, mainly Eric's friend Kelso, who cheats on his girlfriend Jackie. Eric, Hyde, and Donna often mock her promiscuity. She also has a strained relationship with her mother who thinks of her as a freeloader. She leaves the series during the third season but returns in a recurring role during the fifth. In season five, she and Fez marry to prevent him from getting deported. In season six, she is portrayed by a different actress, Christina Moore.

Kelly won the part of Laurie, the promiscuous elder sister of Eric Forman on That '70s Show. After three years, she left the show; it was explained that her character had left to attend beauty school.

She briefly returned to the show in the fifth season in four episodes, but was replaced with Christina Moore.