Ever looked in the mirror to see what messages you've unknowingly been giving off to those around you? Whether we like it or not, our faces are hugely important in shaping how we are perceived. And some studies even suggest that our faces can reveal hidden details of our personalities. From the size of your cheeks to the movement of your eyes, there is a lot to discover in the humble mug. So, what does your face say about you? Some argue that having a wider face is a sign of higher testosterone.

From Zac Efron to Margot Robbie, many of the world's most beautiful celebrities are known for their square faces. Now, a new study claims that people with this face shape are seen as more aggressive than those with oval faces, such as Rihanna and Ben Affleck. Researchers from the University of New South Wales measured the facial-width-to-height ratio (FWHR) of 17,607 passport images of male and female faces, before asking people to rate them for aggression. The results revealed that faces with a high FWHR (square faces) were rated as more aggressive than people with low FWHR (oval faces) – particularly if they belonged to young men. From Zac Efron to Margot Robbie, many of the world's most beautiful celebrities are known for their square faces Researchers from the University of New South Wales measured the facial-width-to-height ratio (FWHR) of 17,607 passport images of male and female faces, before asking people to rate them for aggression.