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.
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](https://www.nzherald.co.nz/resizer/v2/ODUQJRQX4XYVM2IAT3VSTMI6P4.jpg?auth=d3787389ef828f5670b167456965368e33a5b3c2d9a77c925976f2d73fc391f7&width=16&height=11&quality=70&smart=true)
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![Haley Bennett plays Megan in the film.](https://www.nzherald.co.nz/resizer/v2/QYMXGO4LGUAM65JL5NIYIFUCOE.jpg?auth=bf290eb55e88a0e2b820de823285076aa32e661c77060baefdc2124e0084c6e6&width=16&height=10&quality=70&smart=true)
Wait...
!['Who is this woman?' We wish we knew, Allison Janney.](https://www.nzherald.co.nz/resizer/v2/NO6OYUP2REVQZSD44G5D6D6X5Y.jpg?auth=e1ab668d184e790f1dcd3bc83349a13b8f621afe30e3735f79094de85d050582&width=16&height=10&quality=70&smart=true)
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:
![Separated at birth perhaps? Photo / Twitter](https://www.nzherald.co.nz/resizer/v2/ZBJAUY77JW22UOVYNJIG3W62RM.jpg?auth=a7a197fd73d2891a1147f6e97047f0938c16e698ca5f1ddd9d9b169740d60619&width=16&height=10&quality=70&smart=true)
Maybe there should be a DNA test - these two are clearly long-lost sisters.
![](https://www.nzherald.co.nz/resizer/v2/CAP344NTIA2SUOAA3S2T7S4UQM.jpg?auth=cf803525ee22e070950a29b274c291e3f8ca7cb9c99b79d5418f1d18f21b6f2c&width=16&height=3&quality=70&smart=true)