'America's Next Top Model': Demi Lovato speaks out against teen bullying

On Wednesday's Sept. 14 episode of "America's Next Top Model," the contestants will compete in a photo shoot aimed at turning what they've been teased about into something positive.

"Camp Rock 2" and "Sonny With A Chance" star, Demi Lovato, ( who just canceled her Twitter account) will make an appearance to drive home the message that teen bullying can leave lasting impressions on its victims. She, too, was a victim of teen bullying and has been lending her voice to the PACER Center's "Teens Against Bullying" campaign.