Alexis Merizalde Knapp (born July 31, 1989) is an American actress and singer. She is known for her role as Stacie Conrad in the musical films Pitch Perfect (2012) and its two sequels, Pitch Perfect 2 (2015) and Pitch Perfect 3 (2017). She is also known for her role of Alexis in the party film Project X (2012), and her role on the first season of the TBS comedy Ground Floor.