Julianna Guill (born July 7, 1987) is an American actress. She is best known for her role as Bree in the 2009 film Friday the 13th and Scarlet Hauksson in the webisode series My Alibi. She also co-starred in the TBS series Glory Daze as Christie Dewitt. She also starred as Becca Riley in Bravo's Girlfriends' Guide to Divorce. Guill has made numerous guest appearances in television series such as One Tree Hill, CSI: Miami, 90210, How I Met Your Mother and CSI: Crime Scene Investigation. She also had regular roles in the web television series My Alibi and the TBS series Glory Daze. She appeared in the independent teen comedy film Costa Rican Summer which was released on July 16, 2009. She had small roles in the Brian Drolet film 2 Dudes and a Dream and Fired Up!. In 2009, she appeared in a leading role of Katy in Road Trip: Beer Pong. The film which was released straight-to-DVD on August 11, 2009. The film is a sequel to the 2000 comedy film Road Trip. Guill appeared in the 2009 horror film Friday the 13th. The same year Guill appeared in My Super Psycho Sweet 16, the made-for-television film which premiered on October 23, 2009 on MTV and was filmed in Atlanta. The film was released to mixed reviews from critics and had strong ratings on that night. In My Super Psycho Sweet 16: Part 2, which premiered October 22, 2010, she reprises the role of Madison Penrose. The following week saw the premiere of the horror film Altitude, starring Guill in the lead role. She appeared in the Steve Carell comedy Crazy, Stupid, Love and in the 2012 horror film The Apparition, from Dark Castle Entertainment. She guest starred in the NBC comedy Community as Head Cheerleader in "A Fistful of Paintballs". Guill is friends with Community star Alison Brie, with whom she co-starred in My Alibi; along with fellow My Alibi co-star Cyrina Fiallo, they perform together as a singing group The Girls. Between 2014 and 2017, she played Becca Riley in the Bravo television series Girlfriends' Guide to Divorce starring former House co-star Lisa Edelstein.

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