Lauren Conrad wore a simple Foley & Corina dress to the Bloomberg Cocktail Reception before the White House Correspondent's Dinner.
If you want the exact dress, the Foley & Corina Hollywood Dress is on sale at ShopBop for $323.40:

To get the look for a DEAL ... try Hurley's Remy Womens Dress for $37.99 at Amazon:

Or try the V-Neck Dress from Newport News for $29:

And to get her look for a COMPLETE STEAL ... try the Chiffon Babydoll Dress from Forever 21 for $11.90: