Pennsylvania teacher and mother of three accused of sexting and having sex with student

The relationship allegedly started when a teacher approached her student at the high school prom and asked if he'd like to work out at her gym.

For several months last summer, Erica Ann Ginnetti, 33, sent photos of herself in a thong and had sex with the boy in a parking lot, authorities said, according to several local reports.

She was arraigned Friday on 13 charges including sexual assault of a student, corruption of a minor and disseminating obscene material to a minor, reported WCAU-TV in Philadelphia.Prosecutors allege she sent explicit photos of herself undressing, as a well as videos in which she performed sex acts on herself, the station said. The school is located about 20 miles from downtown Philadelphia.

The Lower Moreland High School instructor and the student admitted their affair when questioned by police last week.

Officers were acting on a tip to the statewide ChildLine sexual abuse hotline. A caller said Ginnetti had sent inappropriate photos to the student, according to The Philadelphia Inquirer.

The teacher, who has three children, was released Friday on $50,000 bail and outfitted with a GPS monitoring device, KYW-TV in Philadelphia reported.