Can YOU spot it? Women's holiday snap will make you do a double take (and once you see what's amiss, you'll wonder what took you so long)

While the main focus of the photo is clearly the four women - it's what's in the background that's amiss.

If you take a closer look, every single man strolling past in the background has the exact same head.

The photo has been viewed nearly 500,000 times.

Plenty of people said they were so distracted by the lady on the left's derriere that they failed to spot the clones in the background.