If you can’t tell the difference between the Olsen twins, who turn 27 today, you’re not looking hard enough. Sleek-haired Ashley’s style is groomed and put-together, while bohemian Mary-Kate’s over-sized plaid shirts and faded skinny jeans make groupies look prim. Stand Ashley in front of Mary-Kate and they’re like the human version of a mullet – serious at the front, party at the back. 

Their style does sometimes pay homage to their twindom though, as here, pictured at the CFDAs in 2011, where their bags, by The Row, match, but not quite. Just like them.