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Rex Features
The Transformers star nabbed 33% of the vote, beating competition from Halle Berry and Natalie Portman to top the poll carried out by MSN Movies.
"There's no denying Megan Fox is a compelling choice for a new generation of sci-fi fans," said SFX Magazine editor David Bradley. "She sizzled on screen in Transformers.
MSN Movies editor Ed Holden added: "Sci-fi is full of strong female characters that capture the imagination of the movie-going public. When Transformers was launched just two years ago Megan Fox was an instant hit with fans."
X-Men actress Halle Berry claimed 26% of the vote to rank second, while Milla Jovovich's performance in The Fifth Element was placed third with 17%.
Over 59,000 movie fans completed the survey, which also saw Star Wars actresses Natalie Portman and Carrie Fisher secure 8% of the vote to tie for fourth place with Aliens star Sigourney Weaver.
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