Emma Watson is in Cannes for the film festival. She’s promoting ‘The Bling Ring.’

Emma Watson steps back into another era in an enticing new photo spread for W magazine, wearing vintage Chanel, Erdem and Louis Vuitton. Her hair also flows down her shoulders and heightens her femininity. But she reveals she’s always been a tomboy at heart.

“I’ve never wanted to grow up too fast. I wanted to wear a sports bra until I was 22!” she tells the magazine.

“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.” But there’s no mistaking the fact she’s all grown now.

Watson is in Cannes for the Film Festival to promote her latest picture “The Bling Ring.

The 23=year-old actress stars with Taissa Farmiga, and Leslie Mann and newcomers Israel Broussard and Katie Chang.

Emma Watson Golden Age Sex Siren

Emma Watson Exudes Old Hollywood Glam in 'W' (photos) 1Emma Watson Exudes Old Hollywood Glam in 'W' (photos) 2Emma Watson Exudes Old Hollywood Glam in 'W' (photos) 3Emma Watson Exudes Old Hollywood Glam in 'W' (photos) 4

They play five burglars who hit celebrity homes. Based on a true story, the thieves were active through most of 2008 before they were arrested.

“When I read the script and I realized that essentially it was a meditation on fame and what it’s become to our society, I had to do it,” she said in an interview earlier this year.

“The character is everything that I felt strongly against — she’s superficial, materialistic, vain, amoral. She’s all of these things, and I realized that I hated her. How do you play someone you hate?” she said.

Her character Nicki is one of the ring-leaders. “Who wouldn’t love to go to work in Uggs and very low-slung tracksuit bottoms? The iconic detail of Nicki is her tramp stamp. It’s a lotus flower, a Buddhist-like symbol just above her butt crack. Really classy!” she says.

“At one point I told the costume designer, You can see my bra strap in this top; shouldn’t we pin it?’ And she said, ‘No, sweetie, Nicki is all about her bra strap showing.’ I was like, ‘Right, okay, different mind-set.'”

In her hot photo spread you won’t find any bra-straps showing or a hair out of place. Emma looks like Golden Era Hollywood Screen idol on an old movie poster. She posed for photographer Michael Thompson.