Rob Lowe Reacts to His Sons Trolling Him on Social Media | Full Interview

ET sat down with the actor to talk about his work with Atkins and his new Fox series, '9-1-1: Lone Star,' which premieres in January. Lowe also discussed how his sons, Matthew and John, love to troll him on social media, being a 'third wheel' to pals' Katherine Schwarzenegger and Chris Pratt and his long-lasting love for his 'St. Elmo's Fire' co-stars, including Demi Moore.