Laren Foster (Corina Bizim) is the secondary villainess of the 2016 Lifetime film Pregnant at 17. She was the sister of Greg Foster, a man who robbed a convenience store and attacked the owner, putting him in the hospital. 17-year-old Chelsea witnessed the robbery and reported him to the police, sending him to jail. Laren then began to harass Chelsea at school, believing that she lied and that Greg is innocent. Her harassment leads to Chelsea dropping out of school.
As Chelsea dealt with the fallout of becoming pregnant with the baby of her older lover, married man Jeff, Laren stalked her and reports her findings to Greg, who is about to be released from prison. After learning of her lover's wealth, Laren and Jeff plot to get revenge on Chelsea. During that time, Jeff got hit by a car and Chelsea moved in with his wife Sonia (who has befriended the girl). One day, while out in town, Chelsea sees Greg watching her from outside a store she was in. Frightened, Sonia and Chelsea went to the police, but soon afterwards, Greg and Laren arrived at Sonia's house and held Chelsea and Sonia hostage. They tied up the two women and Greg explained that Sonia was going to give him all her money as retribution for Chelsea sending him to prison. While he took Sonia to the bank, Laren took Chelsea to a secluded cabin. On the way, Chelsea begged Laren to let them go, as she knew Greg is going to kill them, but Laren refused to believe Chelsea and shouted at her to shut up. At the cabin, Chelsea tries to hit Laren with a bottle in an escape attempt, but Laren used her gun to stop Chelsea.
When Greg brings Sonia to the cabin, he reveals that he did plan to kill the two women, much to Laren's shock. She tries to talk him out of it, but Greg refused to listen. As Greg forced Chelsea and Sonia to dig their own graves, Laren confronted Greg about his lie about not intending to kill them, which he brashly admitted to. When Sonia faked a leg cramp and injected Greg with a sedative, Laren chased after her and Chelsea as they tried to escape. When she caught up to them, she accused them of killing Greg before Sonia shot her with the gun she stole from Greg. After Chelsea shoots and kills Greg as well, Sonia called the police for help. Laren's fate was left unknown.