A former Texas middle-school teacher who was impregnated by a 13-year-old student has been sentenced to 10 years in prison.Alexandria Vera, 25, was facing up to 30 years behind bars after pleading guilty to aggravated sexual assault of a child in November. She admitted to police that a relationship that started with Instagram messages between her and the boy blossomed into a romance - one that the boy's family approved of.A judge in the 209th District Court in Houston [...]