David Burtka, Neil Patrick Harris David Burtka, Neil Patrick Harris

Neil Patrick Harris is joining the Freak Show. And no, we're not talking about the Oscars.

Harris and his husband, David Burtka, will guest-star on the fourth installment of American Horror Story later this season, TVGuide.com has confirmed.

Harris will play a salesman in the final two episodes, and Burtka will appear in the season finale as part of a "sexy storyline" with Elsa Mars (Jessica Lange), according to TVLine, which first reported the news.

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Creator Ryan Murphy invited Harris to appear on American Horror Story: Freak Show back in July, via Twitter. The two previously collaborated when Harris guest-starred on an episode of Glee in its first season.

There's no word on whether Harris will sing on the show; however, this could be a nice warm-up for his upcoming variety series on NBC.

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