Emma Watson 'Perks' up!

Anyone whos ever been to a school dance has likely had that moment, when theyre standing on the margins of the dance floor, watching bolder, older kids cut loose with abandon in the center, wondering if they themselves have the nerve to step into the crowd and join in. That kind of adolescent yearning is at the heart of the coming-of-age dramaThe Perks of Being a Wallflower, writer-director Stephen Chboskys adaptation of his own best-selling YA novel of the same name.

In this exclusive clip from the film which premieres Saturday at the Toronto Film Festival and begins a limited release in theaters Sept. 21 young freshman Charlie (Logan Lerman) is the kid on the sidelines, and his new friends, seniors Sam (Emma Watson) and Patrick (Ezra Miller), are the ones tripping the light fantastic on the dance floor. Check it out below: