Heidi Klum reveals inspiration behind her over-the-top Halloween costume transformation

When it comes to Halloween Heidiween, Heidi Klum is in a league of her own.

The former "Project Runway" host has earned a reputation as the queen of Halloween over the years, donning elaborate wigs, detailed dresses and even prosthetics for her costumes. She's been everything from the werewolf in Michael Jackson's "Thriller" music video to Princess Fiona from "Shrek" and Jessica Rabbit.

This year is no different.

Klum played alien to new husband Tom Kaulitz's roughed-up astronaut.

As for the inspiration behind her out-of-this-world costume? "Tokio Hotel, which is the band of my husband. They believe in aliens," Klum told People at her party.

Kaulitz, who tied the knot with Klum in August, added: "Everyone does, no?"

Halloween queen Heidi Klum: Model teases this year's costume months in advance

Despite the spooky outward appearances, their costumes tell a romantic love story.

"I was in space looking for a new planet for humans to live on, right? Cause we already discarded ours," Kaulitz told People about his astronaut. "I found this creature, and I was like, 'Wow, she looks good.' I brought her home. So, hopefully, she has some useful information planned."

Klum documented her elaborate transformation in front of a live audience at an Amazon bookstore in New York City ahead of her annual Halloween costume party.

The supermodel has also chronicled her step-by-step preparation on Instagram.

The star donned full-on silicone prosthetics, including a bodysuit with exposed intestines and metal spikes along her back.

Fans began guessing her look before the reveal.

"Glowing Alien?" designer Zac Posen guessed, while user @larissanobel thought Klum's get-up may be "someone from 'Game of Thrones?'"

Halloween 2019: Jason Momoa's scary-good Elvis talks with Ellen DeGeneres' Cardi E

Klum's costume has been months in the making, literally. The newlyweds told People that they started planning this year's Halloween look in November 2018.

"As they’re taking this (costume) off, I start thinking about next year," Klum said.

Here are some behind-the-scenes shots of the star getting ready:

Contributing: Charles Trepany

Elle Woods alert: Kim Kardashian recreates the 'Legally Blonde' video essay for Halloween

This article originally appeared on USA TODAY: Heidi Klum's 2019 Halloween costume transformation is scary good