Bad girls who steal more than hearts.

13. She may look like a model, but this High School teacher certainly hasn't been exhibiting model behavior! Haeli Wey, a 28-year-old former Math teacher at Westlake High School, faces felony charges for having an improper relationship with two students, the Travis County sheriff's office announced on Dec. 17, 2015. According to police, one of the 17-year-old victim's told authorities that he had sex with Wey about 10 times between August and September. She also allegedly sent him pictures of herself with little clothing. Sex between the student and Wey stopped when he discovered she went on a hike with another student -- during which she reportedly kissed and had a sexual encounter with another 17-year-old student.