Moustaches, once commonly associated with porn-stars and the seventies, are now a respectable addition to the well-groomed exterior of male A-Listers. Brad Pitt has recently been sporting his sprouted whiskers with pride, and he's not the only one.

Josh Hartnett has been carrying his wispy face fuzz to various clubs practically every night, since temporarily setting up shop in London.

Here Jude Law can be seen beaming from beneath a brush of bristles at celebrity events. But why have the men of Hollywood become the men of handlebars?

Throughout history, a moustache has said a lot about the man who sports it. It signifies power with its length and bushiness. Many say Stalin ruled Russia with an iron 'tache......

... it can reveal an unabashed, out-of-control creativity within its wearer. And grown the right way, a moustache can double as a paintbrush.

A moustache is a look that harks back to the golden age of Hollywood, where an uncompromising sophistication was implied by a face fungus that was always prepared to tickle a lip or two...

...and let's face it, a moustache just looks plain cool..

So, one can perhaps understand the facial hair revival in Tinsel Town. Where preened and perfect is the norm, the mild scruffiness of a bit of foliage can almost appear rebellious...

... or perhaps it suggests the early stages of a mid-life crisis.

This month is November where men are encouraged to let the razor gather dust in aid of a prostate cancer charity. So perhaps, all blokes should be taking some grooming advice from the likes of Johnny Depp just don't go overboard