The bob is in no danger of going out of style. Many celebrities are continuing to cut off their long locks for chin-grazing bobs and the longer "demi-bobs" or long bobs. According to Eva Scrivo in her book, "Eva Scrivo on Beauty," the bob originated during World War I as women joined the workforce and no longer had time for pin curls and straightening irons. "Cropped hair became of badge of freedom, rebellion, and independence for working women who had also just gained the right to vote," Scrivo writes.
This season's bob has a bit of edge to it. The hot bobs for 2011 are messy, a bit tousled but they all end at the chin or just below it, like Keira's here. Add in blunt bangs or fringe for a really edgy look.
So who can wear the bob? Anyone with a nice jawline and neck will look good in a bob. If you have a round face, a long bob is a better option for you (see below). As for hair texture, bobs work best on thin to medium hair. If you have curly hair, a bob will turn into a triangle on you, unless you get layers cut in and the ends texturized and if you have fine hair, ask your stylist for a "graduated bob," which are stacked layers that give hair needed body and height at the crown.