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Everyone is commenting on the stunning beauty of actress Amber Heard who plays Johnny Depp's love interest in the movie The Rum Diary. In the next breath comes a remark about Amber's striking resemblance to Hollywood sensation Scarlett Johansson.

The movie industry regularly throws up promising new stars who look remarkably like an actress of proven ability, and who is already a hit with audiences. Maybe the film business wants a back-up, or perhaps there are types of face which work best on camera.

Scarlett's blonde, fulsome-cheeked and big-lipped beauty has landed the 26-year-old leads in such movies as Lost in Translation, Girl with a Pearl Earring and The Other Boleyn Girl.

Look-a-like Amber (25), has filmed alongside Nicolas Cage in Drive Angry, and is beginning to register as a major star in the making.

It's not the first time a unique beauty has been found to have a parallel in an upcoming star. Angelina Jolie (36) is an original in most ways, and yet just when we thought her sultry sexiness was a one-off, along came Megan Fox (25) with a similar knock-out brunette beauty.

The Duchess actress Keira Knightley (26) is known for her delicate brown-eyed beauty. So similar is actress Natalie Portman (30), who got an Oscar for Black Swan, it's hard to believe they're not related.

Though Natalie is older, it was Keira who first made a breakthrough.

Elektra star Jennifer Garner (39) is expecting her third child with husband Ben Affleck. Her bright-eyed and toothy-smile good looks are very similar to those of Oscar winner Hilary Swank (37).

Julie & Julia actress Amy Adams (37) once had the red-haired, fair-skinned and rosy-cheeked look cornered in Hollywood. Now we also have lookalike Isla Fisher (35) who is as well-known for being married to comedian Sacha Baron Cohen as for being an actress, and who'll appear in the forthcoming film The Great Gatsby.