|Voiced by||Mary Kay Bergman|
|First Appearance||Rainforest Shmainforest|
She fell in love with Kenny in Rainforest Shmainforest, but she didn't want to get close to him since they live on the opposite sides of the country. She did get close to him, though, and, as depicted in Spontaneous Combustion, their relationship continued to the point where Kenny was taking frequent bus trips to see her. Despite this, she never gets Kenny's name right due to his mumbled speech, referring to him with similar-sounding names such as "Lenny", "Benny", and various other incorrect names, even though she has heard his name before from other people, like Cartman and Stan.
She knows CPR, in Rainforest Shmainforest, she saved Kenny from dying after he was struck by lightning, by giving him mouth-to-mouth resuscitation. Because of this act, Kelly should be noted as, arguably, the first character on the show to actually care about Kenny's death, she question "who" Stan and Kyle are talking about when they say "They killed Kenny," and says they should do something to try and help him, the concept of which is utterly lost of Stan and Kyle. She also must have some talent singing and dancing, as she was a member of the Getting Gay With Kids choir.