Kelli Brianne Garner is an American actress who has appeared in a variety of independent and mainstream films, television, and theater. A native of Southern California, Garner made her feature film debut at age seventeen in Larry Clark's thriller Bully (2001), followed by a supporting role as Faith Domergue in Martin Scorsese's The Aviator (2004). In 2005, she made her New York stage debut in an Off-Broadway production of Dog Sees God. Over the following several years, Garner had lead roles in the independent film Thumbsucker (2005), the studio comedy Man of the House (2005), and the comedy-drama Lars and the Real Girl (2007). She returned to theater in 2008, appearing in an Off-Broadway production of The Seagull opposite Dianne Wiest. Garner subsequently had a supporting role in the Disney animated film G-Force (2009), and from 2011 to 2012, had a lead role on the short-lived period drama Pan Am, portraying a flight attendant. She later co-starred in Alexandre Aja's fantasy horror film Horns (2014) opposite Daniel Radcliffe. In 2015, Garner portrayed Marilyn Monroe in the television film The Secret Life of Marilyn Monroe, opposite Susan Sarandon. She subsequently guest-starred on the series Looking (2014–2015) before starring as the lead on the NBC drama series The Enemy Within, which ran for one season in 2019. She also had a minor role in the monster film Godzilla: King of the Monsters (2019).