Check Out The World’s Biggest Boobs...Think Cossy has big boobs? Checkout 30yr old German unclad model known as Beshine who is said to own “The World’s Biggest Boobs.” Her boobs fills a Z cup! As of 2011, Beshine’s breasts weighed about 20 pounds each. Her bras are custom made and she struggles to find clothes that fit. In an interview on her web site, Beshine said, “It is always an adventure to be in public with such big boobs.