She attended Flintridge Sacred Heart Academy, an all girls' Catholic high school in Pasadena,[4] where she joined the improv team.

[7] During her time as a student, she starred in the short films Party Favors in 2008, Appropriate Sex in 2009, and Suckerpunch in 2010.

[6] In 2014, Brianne starred as Candy in the comedy film Horrible Bosses 2 alongside Jason Bateman.

[8] In 2015, Brianne moved to London to film her first regular starring role which was in the British television series I Live with Models.

[9] In 2016, Howey landed the role of Kat Rance in the television series The Exorcist, sister of the possessed girl played by Hannah Kasulka.