In Heidi Klum 's life, one day you're a stunning 5-foot-9 model, the next day you're kinda terrifying.

Or, at least, that will be the case this Oct. 31 when the Project Runway host says "Auf wiedershen!" to sexy Halloween costumes at her annual bash.

"I’m hard at work already," Klum confirmed during an August 6 appearance on The Tonight Show Starring Jimmy Fallon . And, yes, she expects her latest offering to be, uh, killer.

"I’m gonna be extra ugly and super scary," she teased. "Let’s not ruin it. We have exactly 86 days, but who's counting?"

Though she couldn't stop herself from serving up just one more teeny hint , sharing a 3D mold of her face to Instagram Oct. 1, writing, "This is just the beginning."

The 52-year-old also tagged prosthetic makeup designer Mik

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