Heidi Klum's Mesmerizing Halloween Evolution

For Heidi's first bash, she wore a costume with a vaguely S&M vibe—spikes, patent leather—and two Pippi Longstockings braids.

It's clear that Heidi is in a Halloween costume, but looking at this, you'd have no idea how committed she would become to the art of dress-up.

Heidi leveled up by quite a bit for her second Halloween bash, making her entrance on a horse as Lady Godiva—an injured or dead one, given the blood dripping from her mouth.

While she wore a floor-length blonde wig and a sparkly white bodysuit, it was conservative by Lady Godiva standards. Legend has it that the English noblewoman rode her horse buck naked through town.

Year three of the model's Halloween hosting gave us scary Betty Boop—scary because she wore fangs under her red pout.

The costume was simple yet striking. Most of the work of getting into character as the iconic cartoon was in the hair and makeup.

It's unclear what exactly Heidi dressed as in 2003. What's obvious is that she went full-out from her braids all the way down to her wild boots.

She had a gold shimmer all over her body and she even wore gold teeth.

In 2004, Heidi arrived at her party dressed as a scantily clad witch with scarlet hair. Her makeup was amazing, as usual. She also kindly gave a skeleton a piggyback ride on her way in.

The model had a whole "fly into the party like an actual witch" thing planned, but she ended up getting stuck in her harness, which undid the witch illusion.

Heidi loves a good stiletto boot to go with her Halloween costume, and in 2005, they were a black patent leather version that went to mid-thigh.

For her vampire look, she had on fangs, an enormous, curly wig, and a bleeding heart pinned to her corset dress.

Heidi was concealing a pregnancy when she showed up to her party as a giant apple with a snake wrapped around it.

"The problem with that was that I was so big, I couldn't fit into a car, so I had to get a convertible at the last moment just so I could get to the party," she told the New York Post. "I couldn't drink water because my arms didn't reach my face, I couldn't even sit. That wasn't so much fun—I didn't fully think that one through!"

After such an ordeal with her apple suit, Heidi showed up the next year in a more relaxed look: a cat bodysuit.

Heidi said that her assistant had come up with the idea for this elaborate costume. "My husband and I were in India last year, so she said, 'Why don't you do an Indian goddess? Like a scary Indian goddess?' And I said 'Okay!'"

But Hindu leaders criticized the costume, saying that the costume was "denigrating."

Heidi and then-husband Seal twinned as two crows. While the costumes made the couple look like monster-size birds, the getups weren't at all practical.

"It was bad. My husband was driving and he could hardly see anything," Heidi said. "When you have a beak on, you can't talk to anyone, you can't really drink. It's not a good costume."