"Diane Von Furstenberg" -- Demi Lovato ("Sonny with a Chance," "Camp Rock") drops by the set of this week's photo shoot to surprise the girls for a conversation about teen bullying on America's Next Top Model on The CW. pictured: Demi Lovato   Cycle 15  Photo: Mathieu Young/The CW  ©2010 The CW Network, LLC. All Rights Reserved

"Diane Von Furstenberg" -- Demi Lovato ("Sonny with a Chance," "Camp Rock") drops by the set of this week's photo shoot to surprise the girls for a conversation about teen bullying on America's Next Top Model on The CW. pictured: Demi Lovato Cycle 15 Photo: Mathieu Young/The CW ©2010 The CW Network, LLC. All Rights Reserved