From an early age, this beauty harbored a desire to perform. By the time her acting career took off, Smart had already studied ballet and found success as a model. After landing a few bit parts in commercials and made-for-TV movies, she made her film debut in 1996's The Last Time I Committed Suicide. On the silver screen, she made an impression as the brainy high-school girlfriend of a quarterback facing the strains of youth in Varsity Blues (1999). Playing a love interest suited her, and she soon appeared as an object of affection in the coming-of-age story Outside Providence (1999). On the small screen, her recurring role on Felicity further exposed her to the teen set, and she used that fame and appeal to win a lead part as a hippie on the NBC miniseries The '70s. Next, she cultivated a sex-symbol status when she portrayed a seductress and went topless for a scene in the comedy Road Trip (2000). Her good looks and girl-next-door charm led to parts in features that centered on male characters vying for her attention in films including The Butterfly Effect (2004), Starsky & Hutch (2004), Just Friends (2005). She won more hearts in a recurring romantic role on Scrubs and then joined the cast of the short-lived crime drama Smith. Though Smith failed to find an audience, she went on to widen her fan base with the 2006 action-packed flick Crank and its 2009 follow-up, Crank 2: High Voltage. Off-screen, she enjoys a long-time relationship with actor Branden Williams, and remains actively involved with environmental causes such as Heal the Bay and The Environmental Media Association.