Krista Morton, 45, of Wellington was arrested in Palm Springs. She is the principal at Mavericks High of Palm Springs, a charter school.
Authorities responded to a report of people involved in sexual activity in a car and found Morton with an 18-year-old high school senior. When Morton opened the door, her shirt was unbuttoned, exposing part of her chest.
Morton told police she had just met the 18-year-old. The student, however, told police that Morton was his principal.
Officers smelled marijuana inside the vehicle.
Both were arrested.
Morton faces a charge of possession of marijuana.