Thanks to British starlet Emma Watson, short hair has found its feet on the red carpet again, accessorising the trend of wearing your boyfriend's wardrobe, for that tough but vulnerable look. If you are actually someone's boyfriend, then we apologise for encouraging her to nick your clothes. But fear not guys, she can get her own shades from sunglasses shop.

THE RULES

• For boys with buzz cuts, keep your eye on the ball with mirrored lenses and fine metal framework. Stand to attention in the style takes for a smooth but masculine look.

• A scruffy mop screams 'I'm with the band' whatever your gender, so go for interesting detailing on the arms and brow bar. Acetate framework in bright hues teamed with opaque lenses will keep things fresh.

• For on trend ladies donning gamine crops, over-sized frames look chic with metal rims. Keep the lenses gradient though- anything too dark will make you look a bit spy-like.

• In order to keep thing feminine, embellished detailing against soft coloured acetate work best.

• If your style is more preppy than princess, then cat-eyed frames fit in with the studious look, but will ensure you're kept pretty as a picture. Delicate features will be able to pull off a more masculine, dark palette and for a stronger feature face, the floral frames and pastels look gorgeous set against short hair.

• With less hair to contend with, you can go for it when it comes to frame shapes. Use intricate cut-out detailing and flamboyant shapes to contrast with a short hair style.