Scarlett Johansson's killer cleavage has beaten off competition from Salma Hayek's awesome assets to be named the best breasts in Hollywood.The actress left other curvy stars trailing in a new poll compiled by U.S. TV show Access Hollywood.But the honour will probably come as no surprise for Scarlett who always knew her breasts were destined for greatness.She said of them last year, “I would never have a boob job. I get compliments about them but I have my parents to thank for them."I think they could win awards, you know!”Halle Berry was judged to have the third-best cleavage in the business. Jessica Simpson and Jennifer Love Hewitt came fourth and fifth respectively.