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This undated publicity photo provided by United Artists and Danjaq, LLC shows Sophie Marceau, left, and Pierce Brosnan in a scene from the James Bond film, "The World Is Not Enough." Modern Bond girls also present a more formidable challenge to the suave secret agent. 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)

This undated publicity photo provided by United Artists and Danjaq, LLC shows Sophie Marceau, left, and Pierce Brosnan in a scene from the James Bond film, "The World Is Not Enough." Modern Bond girls also present a more formidable challenge to the suave secret agent. 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.