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This undated publicity photo provided by United Artists and Danjaq, LLC shows Roger Moore, center, with Maud Adams, left, and Britt Ekland, from the James Bond 1974 film, "The Man with the Golden Gun." Whatever their role, Bond girls still must be inarguably beautiful.The film is included in the MGM and 20th Century Fox Home Entertainment Blu-Ray "Bond 50" anniversary set. (AP Photo/United Artists and Danjaq, LLC)

The evolution of the 'Bond girl'

Who qualifies as a Bond girl has changed over the years, as the

blue-eyed, buxom blonde has given way to more diverse leading ladies,

including Michelle Yeoh ("Tomorrow Never Dies") and Halle Berry ("Die Another Day"). Modern Bond girls also present a more formidable challenge to the suave secret agent.