A teacher has been arrested and charged with incest after a pupil allegedly recognised her and a classmate in a sick video on Pornhub.
Dawn Giannini, 49, who is married to a US army colonel, allegedly appears alongside a 14-year-old family member in the clip.
The horrified student spotted the x-rated clip online and immediately told his principal, who alerted the police.
Mother-of-two Giannini is married to Thomas Giannini, a US Lieutenant Colonel who holds one of the most senior positions in the army.
She was a fourth grade teacher at St. Elizabeth Seton Catholic School in Palo Alto, California, in 2015.
Before that, she was a special education assistant and substitute for the Redwood City School District.
Redwood City School District fired Giannini from a substitute teaching position after she was arrested and she will never be allowed to work in the district again.
Superintendent John Baker sent out an email to parents saying that while it is believed she did not assault a student, the information is “truly heartbreaking.”
She remains in police custody and faces a string of charges – including seven counts of a lewd act on a child and six counts of oral copulation on a child under 16.
She is also accused of six counts of sexual penetration with a foreign object, one count of showing to porn to a child and one count of incest.
San Mateo County District Attorney Steve Wagstaffe would not identify how Giannini and the young girl were related.
The teenager is believed to be the one who posted the clips online.
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