Keira Knightley is a famous British actress and known for her long brown hair. She has been wearing different hairstyles throughout her career. One of her most popular hairstyles was the curly bob. This section will provide information on some of Keira Knightley’s most popular hairstyles that she has used throughout her career. Turn back the clock to her early career with the medium length straight bob. Keira Knightley has had several hairstyles throughout her career, some of which were popular. Some of the styles she has worn include long straight hair and a curly bob that was often referred to as “the Keira”.