Yet another one:

    Brooklyn middle-school teacher - a married mother of three - was arrested yesterday on sex-abuse charges, becoming the third female educator nabbed in a week for alleged shenanigans with male students.

    Joanna Hernandez, 27, was collared after allegedly embracing and kissing a 15- year-old eighth-grader in an empty classroom inside IS 55 in Brownsville nearly a week ago. She was charged with misdemeanor sexual abuse and endangering the welfare of a child.

    Police said a fellow teacher saw Hernandez and the boy lip-locked on April 12 and told the principal, who went to cops and the district superintendent.

    Hernandez was escorted out of the school the same day and reassigned to desk duty at a regional office, according to the Department of Education. It was not clear why more than a week passed before she turned herself in to cops.

    She pleaded not guilty at her night-court arraignment — attended by her mother, father and husband — and was released without bail.

    The judge issued an order of protection to keep her away from the boy.

    Students said the teen in question was "the oldest kid in school" and he routinely stayed late for extra help from Hernandez, who has been at IS 55 since 1999 and is paid $45,583 a year.