A married middle-school English teacher and cheerleading coach will serve six years in prison after she pleaded guilty to having sex multiple times with a 15-year-old student while she was pregnant.

Katherine Ruth Harper, 28, was arrested in April last year and charged with having an improper relationship with a student in Trophy Club, Texas, a wealthy suburb northwest of Dallas.

She pleaded guilty to one court of sexual assault and one count of having an improper relationship with a student, the Denton County District Attorney's Office said, the Daily Mail reports.

After her prison sentence, Harper will be placed on 10 years' probation. She will also be required to register as a sex offender for the rest of her life.

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Harper, a seventh-grade teacher at John M Tidwell Middle School, traded several nude photos with the boy by cellphone, according to the Star-Telegram.

The affidavit says police launched an investigation into the alleged inappropriate relationship after receiving an anonymous tip through the school district website naming Harper and the student, whose identity is being withheld because he is a juvenile.

When a school official confronted the boy with questions about the relationship, he cried and admitted to sex with the teacher, according to the affidavit.

Harper, 28, will serve six years in prison after she pleaded guilty to having sex multiple times with a 15-year-old student. Photo / Trophy Club Police Department
Harper, 28, will serve six years in prison after she pleaded guilty to having sex multiple times with a 15-year-old student. Photo / Trophy Club Police Department

The boy was formerly a middle school student of Harper's.

The teacher and student began trading racy text messages before meeting at the boy's home for sex over the summer break, the affidavit claims.

In an interview with a state child protective services investigator, the boy said that Harper came over to his house and the two drank alcohol together before taking their clothes off, according to the affidavit.

"One thing led to another and she told me to 'put it in' and I did," the boy told investigators, according to Fox4.

The boy said he and Harper had sex multiple times after that in June and July of 2016.

Police seized the boy's cellphone and found records indicating the two communicated 76 times over that time period.

Harper is now pregnant, but it's unclear from the affidavit whether the boy is the father of the child.

"About eight months pregnant, so if we go back in time it's around when that event took place, but she is married, we believe, still. So we're not sure what that leads to," Trophy Club Police Chief Patrick Arata told Fox4.

Harper has been released on a US$15,000 bond.