Alexa Chung's kooky chic has been endlessly emulated, but only Chung is the real deal. And polka dots really are her thing. Click for more photos

Celebrities on and off duty

Alexa Chung's kooky chic has been endlessly emulated, but only Chung is the real deal. And polka dots really are her thing. Photo: Getty images

In these Instagrammed, smart phoned, 24 hour news cycle times it must be awfully difficult to be a celebrity. No longer can you just be 'on'- and stylist prepped - when strutting the red carpet, but at any moment as you go about doing normal everyday things you could be accosted by someone wielding a camera phone.

This means that many celebrities have adoped something of a uniform when 'off duty' but not not really off duty. It usually includes a variation of skinny leg jeans, quality basics such as t-shirts and well-cut blazers, battered biker boots or ballet flats and fedoras. Always a fedora.

To be a proper off-duty celebrity you must also wear over-sized sunglasses or Ray Bans and a top notch tote bag that could well fit the kitchen sink is also necessary.

There are some celebrities who never switch off - it will be sad day when Victoria Beckham is in flats or Beyonce dons a sloppy joe. Others such as Michelle Williams have made the quirky cool hipster vibe their own.

We've charted some of our favourite celebrities on and off-duty, from uber glamour on the red carpet to chic casual ensembles in the daytime. Click through the gallery above for celebrities who get it right from day to eve.

DailyStyle