"Roswell " regular Katherine Heigl has signed on to play a pre-med student in Warner Bros. mystery pic "Valentine." The film, which is currently lensing in Vancouver, will bow Valentine's Day. Heigl, who also appears in the upcoming teen comedy "100 Girls," is repped by the Writers & Artists Agency and is managed by Shelley Browning of Starstruck Films.

"Valentine" also stars David Boreanaz, Jessica Capshaw, Jessica Cauffiel, Denise Richards and Marley Shelton under the direction of Jamie Blank.