If you're yet to see The Girl on the Train, don't worry, we're not about to spoil it for you.

Oh ok, here's a slight spoiler: It's more bad-good than good-good, with a campy B-movie vibe, a scenery-chewing central performance from Emily Blunt and a SHOCK TWIST you'll probably clock within the first half-hour of the film.

However, there's something far more interesting about the film that early viewers just can't get their head around.

It has to do with a certain member of the cast.

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Blunt's joined by a solid line-up, including Justin Theroux, Luke Evans, Allison Janney and Jennifer Lawrence...

Haley Bennett is seen outside of the Christian Dior show during Paris Fashion Week Spring Summer 2017 at the Rodin museum on September 30, 2016 in Paris, France. Photo / Getty
Haley Bennett is seen outside of the Christian Dior show during Paris Fashion Week Spring Summer 2017 at the Rodin museum on September 30, 2016 in Paris, France. Photo / Getty

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Wait...

THAT'S NOT JENNIFER LAWRENCE. Actress and singer Haley Bennett, 28, plays Megan in the film, and her striking resemblance to the more well-known Lawrence has proven to be the most shocking plot twist for some viewers:

Maybe there should be a DNA test - these two are clearly long-lost sisters.