Scarlett Johansson's car boob

Scarlett Johansson nearly crashed her car after being distracted by the sight of her own boobs on a giant Hollywood billboard.

The sexy star was forced to slam on the brakes when she saw how her breasts had ballooned massively in size on the promotional poster.

The 20-year-old beauty claims she was shocked because the poster, which promotes her new film 'The Island', had been digitally enhanced.

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.

"I was like, 'Look at me They wiped out my whole face Oh, that's not my face That's my cleavage' My cleavage was just huge".

Although 'The Island', co-starring Ewan McGregor has flopped at the box-office the poster has been a big hit in Los Angeles with loads of cars slowing down so fans can get a better look at Scarlett.