sigourney-weaver1Sigourney Weaver, who has faced off against aliens more than once, was still shocked when she saw herself as a blue alien in the new James Cameron movie “Avatar,” which premiered in London and will open next week in the United States.

The Hollywood actress, who plays a scientist Grace Augustine in the groundbreaking science fiction movie, was surprised by how lifelike her 3-D alien self looked in the special effects-laden film.

Among Sci-Fi fans, Sigourney is most famous for her role as Ellen Ripley in the “Alien” films.

“I think every science fiction film is so unique, I’d never done performance capture and the whole world of ‘Avatar’ was so fascinating that I felt like I was experiencing it for the first time,” she said on the “blue” carpet at the event.

“I mean it was so shocking because I didn’t know think it would look like me, Sigourney, and it was just very funny. I’m just so looking forward to seeing it again,” she said.

Weaver, 60, added that she didn’t consider Avatar solely a science-fiction film, despite its themes of alien worlds and genetic engineering.

“I consider it a huge old-fashioned, epic swashbuckling love story about humans and aliens. But it’s also about humans in terms of indigenous peoples,” she elaborated.

Sigourney, who was speaking at the world premiere of the film at the Odeon cinema in London’s Leicester Square last night (Dec. 10), was impressed by how well the CGI (computer-generated imagery) graphics) captured the cast’s movements.

“James kept saying to us, ‘There are a lot of special effects, but it’s all about the characters, it’s all about the emotion of the story.’ So we never felt overwhelmed,” she said.

Also on the blue carpet, Stephen Lang, who plays Miles Quaritch in the movie, insisted he didn’t need CGI to improve his muscles because he bulked up for the role. “I can say that there is a lot of computer enhancement in this film, but not on me. I swear to God!” he said.

Another Weaver co-star, Sam Worthington, who has the lead role of ex-Marine Jake Sully in Avatar, agreed working on the film was a definite challenge.

“As it says in the movie, [learning] the [alien] language was a bitch; I have enough trouble doing American let alone Na’vi!” the Australian actor said.