Kathryn Newton is an American actress whose career started in the early 2000s. She made her debut in the soap opera All My Children. Her first starring role on the small screen was as Louise Brooks in the series Gary Unmarried. Her career became more prolific in the 2010s. She starred in the films Bad Teacher and The Martial Arts Kid. She also earned critical praise for her performance in the horror film Paranormal Activity 4. At the same time, she appeared in the shows Dog With a Blog as Emily and Halt and Catch Fire as Joanie Clark. She also played recurring character Claire Novak in Supernatural. In 2017, she played Abigail Carlson in the HBO series Big Little Lies. Her latest roles in movies are in Lady Bird, Three Billboards Outside Ebbing, Missouri and Blockers.