Heather Christina 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 The Princess Diaries 2: Royal Engagement (2004). Her other films include The Devil's Advocate (1997), Scream 3 (2000), Sorority Boys (2002), Saved! (2004), and Hostel: Part II (2007).