Horn was born in Los Angeles, California,and is the daughter of Cindy (née Harrell), a former model and actress, and Alan F. Horn, an entertainment executive. She went to Harvard-Westlake School and graduated in 2006. She has appeared on Rescue Me and guest starred on 3 episodes of The Office. She also played Lynetta Loski in the 2010 movie Flipped.
　　Horn starred in the film Magic Mike, which was released in June 2012.