James Cameron gets honest about Sigourney Weaver's performance in 'Avatar'

James Cameron on Sigourney Weaver's in 'Avatar' films: 'She's little bit older now'Sigourney Weaver first played Dr. Grace Augustine in Avatar in 2009. But she was asked to play a different role in the forthcoming installments.It was Kiri, a teenage Na'vi character. This was quite a challenge for...