Brianna Hildebrand (born August 14, 1996) is an American actress known for starring in the web series Annie Undocumented. Her most visible role is as Negasonic Teenage Warhead in the 2016 superhero film Deadpool, starring Ryan Reynolds, her feature film debut.
Hildebrand starred in a web series Annie Undocumented, which won best web series at the 2014 New York TV Festival. The web series was created by Daniel Hsia, Elaine Low and Brian Yang.
Hildebrand was cast as the superhero Negasonic Teenage Warhead in the superhero film Deadpool on March 30, 2015. The film was shot in Vancouver in April 2015.