Every 'One Tree Hill' Celebrity Guest Star You Totally Forgot About

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. Seems like 'OTH' was a great place to launch your career.

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(Image credit: Getty Images)

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...

Jenny is the Director of Content Strategy at Marie Claire. Originally from London, she moved to New York in 2012 to attend the Columbia Graduate School of Journalism and never left. Prior to Marie Claire, she spent five years at Bustle building out its news and politics coverage. She loves, in order: her dog, goldfish crackers, and arguing about why umbrellas are fundamentally useless.