Can't Buy Me Love (1987)
Can't Buy Me Love is a 1987 teen comedy feature film starring Patrick Dempsey and Amanda Peterson in a story about a nerd at a high school in Tucson, Arizona who gives a cheerleader $1,000 to pretend to be his girlfriend for a month. The film was directed by Steve Rash and takes its namesake from a Beatles song of the same name.
More at Wikipedia.