Both FROWers wore Valentino - natch - for the designer's Haute Couture Fall Winter 2013 in the French capital.
Style icon Olivia Palermo pulled off a challenging look as only she could, layering a strapless black puffball gown over a crisp white tailored shirt with a statement collar necklace.
The Gossip Girl star, 27, wore her hair in a sleek middle parting, with huge dark sunglasses and a pair of understated black pointed courts.
Hilton heiress, Nicky, 29, meanwhile, chose a blush pink tiered lace-trimmed dress, paired with co-ordinating nude - yes, you guessed it, pointed courts!
We can't fault her choice - it's a foolproof way to look groomed, stylish, and elongate your legs at the same time.
But we're not convinced this level of frill should be attempted by us mere mortals - this one might be best left to the pin-thin celebrities only!
Both girls went for pared-back, barely-there makeup to let their statement frocks do the talking.
Whose dress do you like best? Tell us below, as the best comment from across the website each week wins £50!