Emma Watson is sure to have cast a spell on her male audience members after she stepped out in a purple leather dress with a slit in the middle on The Jonathan Ross Show.

The Harry Potter actress, 22, stars in risque new movie The Perks Of Being A Wallflower, and she admits on Saturday night’s ITV1 episode that she finds it hard living up to Hermione’s squeaky clean image.

However, she’s sure to rid herself of any innocent tag after showing off her racy leather outfit.

After Jonathan asked her to describe her outfit, she said: ‘It’s a purple leather dress, with slits.

Watson added about her famous Potter character: ‘She’s  so innocent, she’s so good, that anything in contrast to her looks like crazy. I wear a pair of ripped jeans and they are like, “Emma Watson wearing ripped jeans, what would Hermione say?” it’s like so scandalous.’

Tough girl: The actress sheds her good girl image with new risqué film The Perks Of Being A Wallflower

The actress also admitted she found playing another character daunting.

She explained: ‘I didn’t know if I believed in myself yet as an actress, outside the role of Hermione, which I knew I could do, and I did for a long time.  I didn’t know if I had other people in me or not.

;I did doubt myself a little bit.  I think I’d just played one person, who in many ways was similar to my own personality, and I played her for ten years and I got so comfortable doing that, that the idea of coming out and playing somebody else was terrifying.’