42. Mischa Barton
Worst Performances: The O.C. (TV series, 2003-2006), Walled In (2009), Homecoming (2009)
With all due respect to Mischa Barton, who's battled through driving mishaps and psychiatric confinement since The O.C. ended its small-screen run in February 2007, off-camera woes aren't the sole reason why she hasn't starred in a truly notable project since, well, The O.C.. Stiff while delivering emotional dialogue and generally non-expressive, she, as a performer, is a blank slate who looks pretty enough. But how many other women in Hollywood fit that bill? Hell, see this here countdown.