Some of Kim Kardashian's fans have been left scratching their heads after a recent picture showed she appeared to have an extra thumb on her hand.

Ever in the news, Kim recently took to Instagram to share some pictures from this year's Christmas but the comments had people fixating on one specific detail.

A fan was quick to ask 'why do you have two thumbs in pic 4' and several others wrote in to say they were also puzzling over the 'extra thumb' that had appeared in the shot.