Portman: 'Black Swan role is a challenge'

Natalie Portman has claimed that her latest film role has proven to be a challenge.

The Oscar-nominated actress, who plays a ballerina in Darren Aronofsky's Black Swan, has admitted that she hasn't retained any of the dancing skills that she learned as a child.

The 28-year-old told Parade: "I'm in full ballet mode right now playing a ballerina in Black Swan. I danced until I was like 13, but I definitely remember being better than I am. I was like, 'Wow, I was pretty good as a kid'. Then I went into ballet class, and I was like, 'I'm not good at all. I really suck'. So it's been challenging."

Portman also reveals that she has had a difficult time reading the script to her other new movie Thor due to tight security measures.

She added: "I think everyone has gotten more secretive just because of the preponderance of technology that can scam just about anything. It's like you don't get a script anymore that doesn't have watermarks that would identify you if you ever tried to leak anything. The Thor script is hard to read because it's on some weird coloured paper and they have your name in huge letters across every page.

"And any time you get a phone call from Marvel, it doesn't come up as a normal number, it's like a five-digit code. I've never seen that before. I've had phone calls from people in the government and they don't have that. Marvel's like some like crazy underground world."