Claire Peterson is a fictional character from the 2015 film The Boy Next Door. She is portrayed by actress Jennifer Lopez and is a high school teacher who becomes involved in a dangerous relationship with her neighbor, a young man named Noah. The film explores themes of obsession and the consequences of impulsive decisions. In the story, Claire's life takes a dramatic turn when she engages in a brief affair with Noah, who later becomes increasingly unstable and threatening. The narrative highlights the challenges she faces as she tries to protect herself and her family from Noah's escalating behavior.