AceShowbiz -

Logan Lerman thinks Ezra Miller is Emma Watson's boyfriend in a new clip for "The Perks of Being a Wallflower". In the video, which is debuted on MTV, the three are seen enjoying some casual chats at a cafe. Emma asks Logan what he will do after graduating from high school and he answers that he might pursue career as a writer.

"You could write about us," Emma replies, to which Ezra adds, "Yeah! Call it 'Sl** and the Falcon,' make us solve crime!" Observing his friends' enthusiasm, Logan asks, "You seem really happy together. How long have you been boyfriend and girlfriend?" Emma just laughs when she hears that and clarifies that Ezra is none other than her stepbrother.

In "The Perks of Being a Wallflower", Logan plays Charlie, an introverted high school freshman who slowly comes out of his shell thanks to his new friends, Sam (Emma) and Patrick (Patrick). He is introduced to the awkward times of adolescence, including drug use and sexuality. The coming-of-age drama is based on a 1999 novel by Stephen Chbosky, who also served as the director.

Slated for a September 21 limited release in the U.S., the film is also supported by Paul Rudd, Nina Dobrev, Mae Whitman, Johnny Simmons, Melanie Lynskey and Kate Walsh.

Emma recently told MTV News that she wanted to "kill it" when kissing Logan Lerman in the movie. "I mean, when I read our first kiss scene, it's so epic. It's like the most beautiful scene I've ever seen written on a page," she said.

"And it was like, 'Oh, we're going to have to kill this one!' Like, it's so good, I wanted to do it justice. And it's so emotional and we're both so vulnerable in it, but the main thing was I get to do it with Logan. He makes me feel so safe, so it's going to be fine, which made it fine."