Heidi Klum is En la intimidadhosting her 20th annual Halloween party on Thursday night, and she went all out with this year's costume.

She told People that her costume was a 10-hour long process to put on, and that she would "have a hard time walking."

Turns out she underestimated it a little.

The iconic supermodel and Project Runwayhost started the journey in the window of Amazon's Manhattan storefront in front of an audience.

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After securing a bald cap, she stepped into a silicone bodysuit. She said the flesh prisonskintight base looked like a "chicken." (And before you ask the obvious question: Yes, there's a generously sized pee gap in the crotch.)

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And then took a dinner break, naturally.

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After applying the prosthetic mask, the realfun began.

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Yeah, that's the stuff of nightmares.

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Past the 12 hour mark, she was still going.

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It was after midnight NYC time when the full effect was revealed:

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Here's Klum and husband Tom Kaulitz at her party, as (I guess?) some kind of mid-autopsy sex alien and her mauled astronaut:

That's a lot of effort for one party — maybe next year she'll opt to go as a sexy kitty cat.

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