Bonnie Aarons is an American character actress who is best known for her roles as the Bum in the film, Mulholland Drive (2001), Baroness Joy…Bonnie Aarons is an American character actress who is best known for her roles as the Bum in the film, Mulholland Drive (2001), Baroness Joy von Troken in The Princess Diaries (2001) and its sequel The Princess Diaries 2: Royal Engagement (2004), and the demon nun known as Valak in The Conjuring 2 (2016) and its subsequent spinoff, The Nun (2018).