Every year, Heidi Klumthe reigning queen of Halloweendelivers an unforgettable costume.

She has transformed into a sexyJessica Rabbit, aflamboyant peacock, and even agrotesque worm.

Always one to deliver the unexpected, Klumknewshe had to transform into something unique for this years festivities.

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Photo: Max Montgomery

So, the day after last Halloween, the star instantly got to brainstorming.

I knew I wanted to do something nostalgic, says Klum.

Its my favorite childhood movie of all timeI watched it a million times, says Klum.

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Photo: Max Montgomery

Its a movie that inspired me to dream and imagine the possibility of life beyond Earth.

(Yes, there aretwoE.T.s.)

Their extraterrestrial looks took a whole year to bring to life.

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Photo: Max Montgomery

There were many fittings, and countless meetings, says Klum.

Then, we puzzled everything together to check that they lined up and fit.

We then glued the pieces to their faces, and blended them into the body.

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Photo: Max Montgomery

Everything was finished with a full airbrush job, Marino says.

It was tricky, but we figured it out.

We had to design a head rig to balance on their heads without being too heavy, says Marino.

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Photo: Max Montgomery

For Klum, this proved to be the most difficult thing to navigate while in-costume.

Balancing the headpiece was one of the biggest challenges, she says.

It had to be secure without being too heavy, as I wore it for hours.

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Photo: Max Montgomery

Klum debuted the look at her annual Heidiween party in New York City tonight.

(She wasnt the only famous E.T.

The process drives me a little crazy!

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Photo: Max Montgomery

But I love it, says Klum.

This costume had so many puzzle pieces and layers that needed to fit perfectly for everything to work.

After years of dressing up, Klum admits that shes used to the hours of commitment.

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Photo: Max Montgomery

Her secret for staying sane?

My main trick is to embrace the process and find inspiration in it.

Its not something you’ve got the option to just unzip and take off!

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Photo: Max Montgomery

Klums annual star-studded Heidiween bash is certainly worth all of the effort.

Its all about creating a new persona for the evening and enjoying it together.

As for how Klum will be spending the dayafterHalloween?

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Photo: Max Montgomery

I sleep in, take a bath, and pamper myself with a face mask, says Klum.

(E.T., stay home!).

I want to rehydrate my skin after all the work we put into the costume.

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Photo: Max Montgomery

I also get a manicure and pedicure, since I usually have to shorten my nails for the costume.

Her most important post-Halloween, task, though, is to begin brainstorming Halloween 2025.

(Yes, really.)

I start thinking about next year, and then we do it all over again!