One Tree Hill convinced me to move to America. Okay, that's not strictly true—I moved to America from the U.K. for reasons that, should you ask me at a dinner party, were entirely more rational—but all the hours I'd spent spent lusting after Tree Hill's small-town charm and unreasonably hot residents played a role. On any given evening between 2005 and 2010, you could find me illegally streaming the WB-turned-CW classic on a battered PC; I am, in short, a One Tree Hill superfan.
In the long, long years since One Tree Hill called it quits, I've spotted its biggest stars in a handful of shows—James Lafferty in The Haunting of Hill House, Sophia Bush in Chicago P.D., Bethany Joy Lenz in Grey's Anatomy—but it's the former guest stars I see everywhere. Whether they're releasing albums (Bryan Greenberg), popping up in theaters (Joe Manganiello), or hosting Extra (Maria Menounos), a ton of One Tree Hill's onetime guest stars have since leapfrogged into fame and fortune in their own right. Like these 15, ahead...
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