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They say jealousy is a disease - and no-one is immune from the occasional bout.

And on those occasions we do wrestle with the green-eyed monster, we tend to keep it to ourselves. 

So spare a thought for the envious people in these photos, who found themselves in front of the camera at just the wrong moment - and with their feelings written all over their face. 

From the slender girl caught casting a sidelong glass at her friend's more ample assets, to the third wheel snapped scowling as his pal kisses his girlfriend, these photos shared online are a reminder to always be alert for the camera's flash.