Alexis Merizalde Knapp (born July 31, 1989) is an American actress. She is known for her role as Stacie Conrad in the Pitch Perfect film series (2012–2017). 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.
Knapp was born in Avonmore, Pennsylvania, the daughter of Marjorie and Bradford Elwood Knapp. She grew up in the Outer Banks of North Carolina before leaving home and moving to Los Angeles at the age of 18.
At age 18, Knapp moved to Los Angeles. There in 2008 she hosted a popular internet video series titled 'Project Lore', a show about the videogame World of Warcraft, and also worked as a model before breaking into acting. She appeared in background roles in Percy Jackson & the Olympians: The Lightning Thief as Aphrodite Girl #9 and in Couples Retreat as a Dance Academy Girl. In 2012, Knapp appeared in her first major roles, playing Alexis in Project X, and as Stacie Conrad in the hit film Pitch Perfect playing a sex-crazed Barden Bella. She reprised her role in the latter's 2015 sequel, with a brief cameo in the 2017 sequel.