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Justin Bartha (born July 21, 1978) is an American film and television actor, best known for his co-starring role as Riley Poole in the National Treasure feature films and as Doug Billings in The Hangover.

Influenced
as Jordan

Nuked
as Jack Langer

National Treasure: Edge of History
as Riley Poole

Dear Zoe
as David Gladstone

Sweet Girl
as Simon Keeley

Godfather of Harlem
as Robert Morgenthau

Driven
as Howard Weitzman

The Big Break
as Stephen

The Other Two
as Justin Bartha

Against the Clock
as Peter Hobbs

Sorry For Your Loss
as Ken

The Good Fight
as Colin Morello

Sticky Notes
as Bryan

Atlanta
as Marshall Johnson

White Girl
as Kelly

Cooper Barrett's Guide to Surviving Life
as Josh Barret

Wolfpack Only: The Hangover Retrospective
as Self

CBGB
as Stiv Bators

Brahmin Bulls
as David

The Hangover Part III
as Doug Billings

The New Normal
as David Sawyer

Dark Horse
as Richard

The Hangover Part II
as Doug Billings

Conan
as Self - Guest

Holy Rollers
as Yosef Zimmerman

WWII in HD
as Jack Werner (voice)

The Rebound
as Aram Finklestein

Every Jack Has a Jill
as Jack

The Hangover
as Doug Billings

New York, I Love You
as Justin, Sarah's Boyfriend

National Treasure: Book of Secrets
as Riley Poole

Teachers
as Jeff Cahill

Failure to Launch
as Ace

Trust the Man
as Jasper Bernard

National Treasure
as Riley Poole

Strip Search

The Ellen DeGeneres Show
as Self

Gigli
as Brian

54
as Clubgoer (uncredited)
Hal