Fans are blowing up over Kourtney Kardashian's Photoshop fail

This time, Kourtney Kardashian is under fire from fans who have pointed out an epic Photoshop fail in her latest Calvin Klein campaign.

The black-and-white image shows Kourt in a CK bra and jeans with two arms behind her back and it all looks totally normal except for the fact that her arms are two very different sizes.

It wasn't long before fans called out Calvin Klein for the 'Photoshop fail', taking to Twitter and Instagram to roast the pic.

"WTF is up with Kourtney’s arm? Also, weren’t Kylie and Khloe pregnant at the same time?," commented one fan.

"Fire your photoshop artists," another said.

Another wrote: "KOURTNEY’S ARM HAHAHAHAHAHHAHHAHAHHA WTF."

"Love them all but is this not the stranger photo ever🤣🤣🤣? Kendal looks like she’s been stuck on it and look at Kourtney’s arm," shared a fan.

A spokesman for Calvin Klein defended the image, saying the lighting was to blame for playing trickery on our eyes.

"You can see in the high-res version of that image [that] there are no issues with Kourtney's arm; however, the light is hitting it which makes it slightly less defined," they said.

Mmm-k.