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When Coco Rocha and Zac Posen get together, you can be guaranteed the results will be memorable. The Canadian model is one of the designer's muses, and often accompanies him to events dressed in his most dramatic creations.

Last night's party to celebrate Bergdorf Goodman's 111th Anniversary was one such occasion, as Coco appeared on Zac's arm in a dramatic deep red corseted fishtail gown from the Zac Posen Resort 2013 collection.

It's another faultless Posen moment from Coco - she wears these dresses with incredible confidence and class, and by teaming the one-shoulder gown with simple hair and equally dramatic makeup, she really shows it off. Of course her model stature helps!

The dress was originally worn in the lookbook by another of Posen's raven-haired, porcelain-skinned model favourites, Erin O'Connor.

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Who do you think wore it best?

Shop Zac Posen at Bergdorf Goodman and Net a Porter now.