"The Island" actress Scarlett Johansson recently confessed she almost had a car accident when she saw how big her breasts were on a giant advert with herself.

Johansson was driving through Los Angeles when she saw the poster from "The Island", where the picture of her breasts was digitally modified to promote the movie. The actress confessed she's still in shock since then.

She said: "I was driving through Los Angeles and I look up and see the biggest photo of me I have ever seen in my life on a massive ad space.

I screamed and slammed on the brakes. I couldn't believe it. It's very strange to see my cleavage the size of a brontosaurus. My breasts were huge. I had long hair and my goodness, I couldn't get past the cleavage."

"The Island", in which Scarlett stars alongside Ewan McGregor, has flopped at the US box office.

Scarlett declared she found it difficult filming the spectacular action scenes, because her legs couldn't take the constant exertion.

She says, "My knee was permanently bruised. I hit my head once. That was bad. It could have been my eye. Ewan had it just as bad. He had some pretty gross, gory wounds. But we were the casualties of war, I guess.

You can't complain. Time is money on a movie set. A couple of times I'd be in so much agony but you just keep doing it."