Lookalikes: Knightley & Portman

Be honest, do you know whether you're looking at Keira Knightley or Natalie Portman? OK, if it's a British costume drama, chances are you're watching Keira Knightley. But both have played cuckoo broads: Knightley in A Dangerous Method, and Portman in Black Swan.

Keira Knightley

Knightley bio: Born 26 March 1985 in London, England. In 2008, Forbes said Knightley was the second highest paid actress in Hollywood, having earned $32 million in 2007, making her the only non-American on the list of highest paid actresses.

Knightley's best movies: Pride and Prejudice (2005); Attonement (2007); A Dangerous Method (2011).

Knightley's worst movies: Domino (2005); Silk (2007); London Boulevard (2010).

Critic's view: The Daily Telegraph writes of Knightley's role as Sabina Spielrein in A Dangerous Method, [Director David Cronenberg] has coaxed a performance from Knightley so ferocious in these early scenes that it seems likely to become the film's main talking point... it’s Knightley that one remembers, for a full-on portrayal that is gutsy and potentially divisive in equal parts.

Critic's view: The New York Observer writes of Knightley in Pride and Prejudice, Dare I say that even Jane Austen herself would have delighted in the final triumph of Ms. Knightley's quick-witted Elizabeth in this film? Yes, I do, and all the highbrow and middlebrow cinephobes of the world be damned.

Natalie Portman

Portman bio: Bborn June 9, 1981 in Jerusalem, Israel. In 1999, she enrolled at Harvard University to study psychology while still working as an actress. She completed her bachelor's degree in 2003.

Portman's best movies: Garden State (2004); Paris Je T'aime (2006); Black Swan (2010);

Portman's worst movies: Free Zone (2005); Goya's Ghosts (2002); Your Highness (2011).

Critic's view: The St. Louis Post-Dispatch writes of Black Swan, Portman hasn't been this good since her early performances in The Professional and Heat, and is deservedly attracting intense Oscar buzz..

Armand Whyte's opinion: Keira Knightley and Natalie Portamn are interchangeable in many roles. You want a thin, waif-like white girl, chose either. But Knightley in A Dangerous Method and Portman in Black Swan have carved out their own convincing roles.

Academy award: In 2011, Portman won the Academy Award for best actress for her role in Black Swan.