Her character in the new film The Bling Ring is all about trashy outfits and wild behaviour.
But Emma Watson is the complete opposite of her on-screen alter ego in a new W Magazine spread.
The 23-year-old channels a sultry screen siren of yesteryear on the cover of the June/July issue of the fashion magazine, in which she admits 'being sexy never really held any excitement' for her.
Scroll down for video...
Sultry siren: Emma Watson oozes old school glamour in the June/July issue of W Magazine as she admits 'being sexy' was never her goal
The Harry Potter star wears her shoulder length hair in glamorous ringlets, and adds a pop of colour with crimson red lipstick in the film noir photo shoot.
On the cover, she is seen wearing lacy beige fishnet stockings and a menswear jacket, her head suggestively cocked to one side.
In another black-and-white shot, she oozes sex appeal as she reclines on a chaise lounge wearing a tight-fitting black dress and netted gloves as she gazes seductively into the distance.
Risque: Emma wore lacy fishnet stockings and a menswear jacket as she posed on the cover
The former child star admitted in the interview that she 'never wanted to grow up too fast,' and made sure her first kiss occurred off a film set.
'I wanted to wear a sportsbra until I was 22!' she said. 'The allure of being sexy never really held any excitement for me.'
'I’ve never been in a terrible rush to be seen as a woman,' added the actress, who was allegedly 'meticulous' about her hair and makeup and 'aware of every frame' during the shoot.
'It was not diva behavior; she was lovely and polite yet exacting,' said W Editor At Large Lynn Hirschberg. 'Perhaps this is how you gracefully transition from child to adult in the global eye: Be bold but never, ever sloppy.'
Polar opposite: Emma said her character Nicki in The Bling Ring was 'so different from me'
Emma will appear in the new film The Bling Ring, the true story about a group of money-hungry teens who broke into the homes of various stars, including Lindsey Lohan and Paris Hilton.
The actress plays ringleader Nicki, who is seen doing everything from casually holding a shotgun in her hand to dancing seductively in a smoky club.
Emma said playing the role forced her to go outside of her comfort zone: 'Nicki is so different from me. How do I try and understand a young woman who loves these things so much that she is prepared to commit crimes to have them?
'With Nicki, I was really taking on a character. Some of her lines are so crazy and absurd—making sure she wasn’t a parody was a challenge,' she added.
Pure elegance: Emma looked gorgeous in a slim-fitting gown at the premiere of The Bling Ring on Thursday at the Cannes Film Festival in France
Emma also had a hard time understanding Nicki's choice of outfits.
'Who wouldn’t love to go to work in Uggs and very low-slung tracksuit bottoms?' said the star. She then joked about Nicki's 'tramp stamp'.
'It's a lotus flower, a Buddhist-like symbol just above her butt crack. Really classy!'
One day on set, Emma asked the costume designer whether they shouldn't do something about her bra strap showing through under a top.
'"No, sweetie—Nicki is all about her bra strap showing,'" Emma said the stylist replied. 'I was like, "right, okay, different mind-set."'
English rose: Emm, pictured on Thursday in Cannes, admitted during the interview that her biggest celebrity crush was Kevin Costner
He's old enough to be her father, but Emma also admitted her number one celebrity crush is Kevin Costner.
'I met him in an elevator the other day, and I couldn’t even speak,' she said.
'He said hello, because he is lovely like that, and I couldn’t say anything back,' she added.
Back in the day: Emma found fame playing Hermione Granger in the wildly successful Harry Potter franchise