Pregnant cheerleading coach, 27, is accused of having sex with a male student, 15, and sending him nude photos
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- Texas teacher Katherine Ruth Harper, 27, arrested last week on child sex charge
- Harper teaches seventh-grade English and coaches tennis and cheerleading
- Accused of trading racy text messages and sex with 15-year-old-boy last summer
- Boy confessed to relationship in tearful interview with investigators, cops say
- Harper is now eight months pregnant; unknown if student is father of child
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