As Harry Potter's sidekick Hermione Granger, she plays the perfect pupil with a butter-wouldn't-melt smile.

But as these pictures of Emma Watson prove, the 17-year-old is growing up fast.

In a photoshoot for Tatler, the young actress swapped her neatly pressed Hogwarts school uniform for Yves Saint Laurent and Chanel dresses, cutting an assured figure.

All grown up: 17-year-old Emma shows how mch she's changed in her new Tatler fashion shoot

But despite stepping out on the celebrity social circuit recently, Emma, from Oxford, said she remains reassuringly "normal".