Credit: Courtesy of The Everett Collection; Steve Granitz/WireImage

For the last few years, the bob has been Hollywood's go-to cut. While the latest celebrity converts, like Christina Aguilera, Jessica Alba and Heidi Klum, are creating fresh, flattering and decidedly 2010 takes on the classic style, we went back in time to see how the famous cut is forever reinventing itself. Click on to see the evolution of the bob, fromLouise Brooks's defining flapper style to Katie Holmes's sophisticated crop!