|Band Job||Bass guitar|
Katie (portrayed by Rebecca Brown) is one of the students at Horace Green Prep School which Dewey Finn temporary teaches at during the film. Katie becomes a member of the band during the film where she plays bass guitar. She was originally a cellist.
She is portrayed as a quiet, polite girl, but eagerly takes an interest in rock music. In the commentary, it is revealed during the credits she was supposed to have a solo, but it was cut out. Dewey's nickname for her is "Posh Spice".