I don't mean to be cynical but I doubt this is for Betsey Johnson. I'm sure Bianca is wearing an item by Betsey but I don't think it's an actual ad for the designer. It's likely just an editoral featuring Betsey's clothes.
Betsey Johnson changed her mind about short models, in cycle 2 remember jenasica 5ft7 models. Thats great how betsy changed her thinking about short models