(Cover) - EN Showbiz - Emma Watson fans should "gird [their] loins" before watching her new film, warns her co-star.

The actress has waved goodbye to sensible witch Hermione Granger, who she played in the Harry Potter movies.

She portrays a completely different character in The Perks of Being a Wallflower, out next year. The picture follows Charlie, a high-school freshman who is led astray by two seniors among them Emma's character Sam.

"You better gird your loins," said Emma's co-star Ezra Miller. "When it comes to Emma people just have no idea. People have no idea what they're in for. It's great!"

The film is based on the novel by Stephen Chbosky. It includes steamy scenes and some of the characters take drugs, which Ezra knows will shock many.

"It's very much about how we manifest abuse," the star told E! Online.

Ezra isn't the only star who has praised Emma's performance.

Nina Dobrev, who also appears in the release, is amazed by how talented the actress is.

"The world has only seen her basically in one role - a pretty conservative, sweet, smart character, which is great," Nina previously said. "But this one, she pushes the envelope in a different way than anyone's ever seen her, which is really great. It's a great role for her." (C) Cover Media