Emma Stone:"I usually wear a one-piece."

 Emma Stone looks sexy and flawless in a red-and-white striped bikini on the July cover of Vanity Fair -- but don't get used to it.

"I usually wear a one-piece," Emma Stone, 22, tells the magazine, admitting that she was nervous for the cover shoot. In a playful mood, the up-and-coming star jokes that her only vices are sugar, wine, and black-tar heroin!

Emma Stone is set to become Hollywood's next big thing, costarring with Andrew Garfield in 2012's The Amazing Spider-Man plus three summer 2011 films (The Help, Friends with Benefits, and Crazy, Stupid, Love), and admits she's become "more conscious" of staying thin.(R)