Heather Christina Amy Marie Matarazzo (born November 10, 1982) is an American actress. Her breakthrough role was Dawn Wiener, a dorky girl in the film "Welcome to the Dollhouse" (1995). She played Lilly in "The Princess Diaries" (2001) and "" (2004). Her other movies include "The Devil's Advocate" (1997), "Scream 3" (2000), "Sorority Boys" (2002), "Saved!" (2004), and "" (2007).