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In this film image released by Paramount Pictures, Leonardo DiCaprio, left, and Kate Winslet are shown in a scene from the 3-D version of James Cameron’s romantic epic "Titanic." (AP Photo/Paramount Pictures, Rick Lynch)

Leonardo DiCaprio's teen look-alike

Australian actor Callan McAuliffe will play the teenage version of Leonardo DiCaprio's leading man in Baz Luhrmann's upcoming Great Gatsby adaptation set to release in December 2012.