December 14, 2009 10:08 pm Sam Worthington Goes Native in “Avatar” Sam Worthington chats about the challenges of immersing himself in the world of “Avatar” and what it was like kissing Zoe Saldana. US & World Videos 1:36 WATCH: Some of the most talked about looks at the Met Gala 3:15 NSC reviewing cease-fire proposal: ‘I don't know that it gets any more sensitive than it is right now' 2:23 Climate change is moving Tornado Alley and driving more tornado outbreaks 1:47 Reese Witherspoon and Ryan Phillippe's daughter Ava calls out body shamers 1:41 Trump fined additional $1,000 for gag order violation and threatened with jail