Whitney Port of The City and Sammi "Sweetheart" Giancola of Jersey Shore.

Photo: Getty Images

There was a melding of the fashionable MTV stars this weekend! Whitney Port of The City and Sammi "Sweetheart" Giancola of Jersey Shore attended the Rolling Stone Hot Party in Las Vegas on Friday night, and inevitably, we have to take a look at their outfits. Both of the stars reached for little black dresses for the event -- Whitney Port wore a long, loose sequin shift and black peep-toe booties, while Sammi "Sweetheart" wore a spandex black dress and nude T-strap pumps. So, who had the better outfit? Usually, we'd side with Whitney, since she's a fashion designer and everything. But for this one, we're going to pick Sammi "Sweetheart" -- she managed to flaunt her body and curves really well, while still covering everything up. But what do you think?

+ Who looks better in black -- Whitney Port or Sammi "Sweetheart"?

Whitney Port of The City and Sammi "Sweetheart" Giancola of Jersey Shore.

Photo: Getty Images