Maude Apatow (born December 15, 1997) is an American actress. She is the eldest daughter of director Judd Apatow and actress Leslie Mann and is known for her roles as the daughter to her real-life mother's characters in Knocked Up (2007), Funny People (2009), and This Is 40 (2012). Apatow first appeared in the 2007 comedy film Knocked Up, written, produced and directed by her father Judd Apatow. In 2009, she played Mable, the daughter to her real-life mother's character again in Funny People, another film her father wrote, produced and directed. In the film, she plays Sadie to parents Pete (played by Paul Rudd) and Debbie (played by her real life mother, Leslie Mann). Her sister in the film, Charlotte, is played by her real-life sister, Iris Apatow. She reprised her role of Sadie in the spin-off to Knocked Up, the 2012 film This Is 40. When she is not acting, she is noted to have a large Twitter fan base, which helped her become a contributor to Zooey Deschanel's website Hello Giggles. She is currently enrolled at Northwestern University studying Radio, Television, Film.