I have never disliked any of her red carpet looks until now. I get what she's going for (something more edgy, flapper-esque) but I think it just misses the mark and looks kind of tacky.
I hate the neckline with the overall proportions of the dress and slip, I think that's what ultimately ruins it for me.
Edited to add: I think that Gabrielle Union is much more successful with her edgy/flapper-esque outfit. She looks flawless and I love the way the crop top separates modernize the flapper look.