Heidi Klum Has Her First Fitting For This Year's Halloween Costume -- See the Pic!

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Heidi Klum is getting in the Halloween spirit!

The 43-year-old supermodel took to Instagram on Thursday to share a snap from her first fitting of this year's Halloween costume… and we can't seem to figure it out.

WATCH: Heidi Klum Goes All Out In Vampy Jessica Rabbit Costume at Epic Halloween Party

"First fitting for Halloween ..... Hmmmmmm...?..... what am I going to be this year ?" she wrote alongside a mirror selfie of her pants-less ensemble. "Can you guess !?!?!?!?!?!"

While it may seem a little early for costume fittings, Klum's Halloween planning actually begins much earlier. 

WATCH: The Sexiest Celeb Halloween Costumes of All Time

"November 1st, the day after Halloween, I start wracking my brain already [with] what I'm going do the next year. I don't know why, but for me, Halloween is such an amazing fun night," Klum told ET before her party last year, adding that her own love for the holiday inspired her famous annual Halloween bash.

"Literally 15 years ago I thought, 'Why is there no gigantic Halloween party in New York City? This is New York City! They should take this more seriously!' And so I thought I wanted that to be my night where people really go all out, and I always put on the invitations 'if you don't have a costume you will not get in.'"

Throughout the years, Klum has definitely stepped up her Halloween game, and she says her party guests have followed suit.

"I love that process, and I feel like you have more fun that way too," she added. "I feel like when everyone is in costume, they're just more free and they have more fun and just makes the whole night more special."

RELATED: Heidi Klum Previews Her Halloween Costume and We Can't Figure It Out

While we'll have to wait until Halloween night to find out what costume Klum rocks this year, take a look inside last year's preparations in the video below.

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