Julianna Guill was born on July 7, 1987 in Winston-Salem, North Carolina, USA as Julianna Minetree Guill. Her parents are Ann and Earl Guill. She is one of three children who all grew up singing and acting. She began tap, ballet and jazz dance at an early age, and continued singing in the choir while at R.J. Reynolds High School, from which she graduated in 2005. She also performed in local theater productions, and attended New York University before moving to Los Angeles. Early in her career, she made numerous guest appearances in television series such as One Tree Hill (2003), CSI: Miami (2002), 90210 (2008), How I Met Your Mother (2005), and CSI: Crime Scene Investigation (2000). She also had a regular role in the web television series My Alibi (2008) as Scarlet Haukkson.She had small roles in the Brian Drolet film 2 Dudes and a Dream (2009) and Fired Up! (2009). She appeared in a leading role of Katy in Road Trip: Beer Pong (2009), which was released straight-to-DVD, and in Friday the 13th (2009). The same year she appeared in MTV's My Super Psycho Sweet 16 (2009). The film was released to mixed reviews from critics and had strong ratings. She also appeared in the independent teen comedy film Costa Rican Summer (2010), and had a lead role in the thriller film Altitude (2010). She also had a recurring role on the TBS series Glory Daze (2010) as Christie Dewitt. Next year, she co-starred in the Steve Carell comedy Crazy, Stupid, Love. (2011), and guest starred in the NBC comedy Community (2009) as Head Cheerleader. She also had a role in the Dark Castle production The Apparition (2012).She also had a recurring role on Underemployed (2012) and a main role on the short lived Bad Samaritans (2013). Her more recent roles include a recurring role on Girlfriends' Guide to Divorce (2014), and lead roles in the dark comedy Killing Poe (2016) and Bad Night (2015). She also guest starred on Rush Hour (2016) and Relationship Status (2016), and had a role as Stark's Assistant in Captain America: Civil War (2016).