Bonnie Aarons (born June 3, 1979) is an American actress and writer. She is best known for her roles as the bum in "Mulholland Drive" (2001), Baroness Joy von Troken in "The Princess Diaries" (2001) and its sequel, "" (2004), and the demon nun Valak in "The Conjuring 2" (2016) and its spinoff, "The Nun" (2018). 