Both babes left their blond locks loose and curly and kept their accessories simple for their ensemble.
While Heather picked black strappy heels to complete her look, The Hills villainess opted for nude peep-toe pumps.
It looks like Heather went sans underwear and Kristin wore a flesh-colored coverup underneath, but it's tough to say.
Who do you think wore this racy little black dress best? Sound off below.