Sam Worthington’s ‘Avatar’ Filming UPDATE: ‘We Just Keep Going’ (Exclusive)

Sam Worthington hit the L.A. premiere of “Horizon: An American Saga,” where he spoke to “Extra’s” Vanessa Borge. He noted it was a steep learning curve working with Kevin Costner and joked about his advice on set as the director: “Act better!” Kevin’s sons are in the movie, but Sam said his three boys still don’t know what he does and that his best role is just as their dad. Plus, he gave an update on the latest with “Avatar,” which he said is always an ambitious undertaking and just keeps going! “Horizon: An American Saga” is in theaters June 28.

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