A striking vision in white, the model was accompanied by three well-dressed young boys at her side. Many will know them as The Countess and the undead children she is fond of.
The arrival of these eerie characters is in anticipation of the series' fifth season premiere on Tuesday 20 October on FOX.
The Countess roamed the streets of London, walking down city streets and passing Parliament and the Big Ben, with many passersby doing a double take.
Even X Factor stars Rough Copy were shocked as they sat next to them on the tube!
The Countess' custom floor-length white gown is the actual dress featured in episode one.
The 13-episode, fifth instalment of American Horror Story: Hotel features an all-star cast including Lady Gaga, Kathy Bates, Angela Bassett, Sarah Paulson, Evan Peters, Matt Bomer, Denis O'Hare, Wes Bentley, Cheyenne Jackson and Chloë Sevigny.
American Horror Story: Hotel premieres on Tuesday 20th October at 10pm on FOX
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