Home People Mariah O'Brien Mariah O'Brien movies Mariah O'Brien movies Mariah O'Brien Movies (5) Jam (2007) As Rose. She was 36 years old Diamonds (1999) As Tiffany. She was 28 years old Being John Malkovich (1999) As Girl Creeped Out by Malkovich. She was 28 years old Together and Alone (1998) As Buffy. She was 27 years old Halloween: The Curse of Michael Myers (1995) As Beth. She was 24 years old