Joe Jonas Raids Fiancée Sophie Turner's Wardrobe for 'Game of Thrones' Halloween Costume

Joe Jonas might have had the most authentic "Game of Thrones" Halloween costume this weekend ... of course, it helps when you're engaged to a cast member.

The 29-year-old Jonas brother dressed up as Sansa Stark — played on the show by his fiancée, Sophie Turner — for Kate Hudson's Halloween Party presented by Amazon.

Turner was not quite as elaborate with her costume — she was an elephant.

Jonas showed off a few photos from the evening on his Instagram page, captioning the pics, "another Saturday Nite ?."

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