Justin Timberlake may have been rocking his 'suit and tie' at "The 20/20 Experience" album release party in LA on the 18th, but not every celebrity guest chose to dress things up in the same fashion. While Emmy Rossum looked chic in a floral embroidered frock from Topshop and Victoria Justice got her glam on, too, in a metallic Alice and Olivia mini, our other favorite starlets kept it causal in skinnies with simple tops. Both Nikki Reed and Jordin Sparks, although perfectly polished, took to the red carpet in dressed down fashion, donning an everyday type pairing of black pants and white blouses. If you got the chance to party with JT, would you have gone with their laid back rock 'n roll vibe, or would you have donned something more standout like Rossum and Justice? We'll just have to wait and see what the attire proves to be in November when Timberlake releases volume two of his '20/20 Experience.'