You can't buy Vanessa's dress at the moment as it is part of Forever Unique's S/S 2014 collection and so is not yet available. Forever Unique have mentioned it's 'coming soon' on their Twitter page though so be sure to check out their New Arrivals to get it when it lands.
I have already blogged about the dress Mollie King is wearing in the photos linked above and you can view that post here.
Item image via Forever Unique.
