Emma-Roberts_Wmag_012-064.jpgPhoto Credit: Inez and Vinoodh/Wemmaw230.jpg

Like most tween Disney and Nick stars, Emma Roberts, 19, seems intent on leaving her good girl image behind now that she's an adult. And that may include a "full-on sex scene" for the Unfabulous star, who appears on the cover of W with actresses Zoe Kravitz and Mary Elizabeth Winstead.

"I don't know that I'd do a full-on nude scene, ever," Julia Roberts's niece told the mag. "I've never had a full-on sex scene ... but we'll see."

Although she's far from nude, Emma does pose in nothing but a bra for a sexy pic inside the mag.

Emma, who has "always wanted to be an actress" has several more adult roles coming up in films like What's Wrong with Virginia, Scream 4 and It's Kind of a Funny Story. No word on whether any of those films will test her sex scene resolve!