When it comes to Halloween costumes, nobody does it better than supermodel Heidi Klum.

No drugstore witch costumes or hole-ridden sheets for this gal. And as her annual Halloween party (co-sponsored by StyleList this year!) approaches, we thought we'd scare up a few of the Ann Taylor spokeswoman's getups from Halloweens past and find out the inside scoop from her costume mastermind and Victoria's Secret wingman, Martin Izquierdo.

StyleList: What is your design process for Heidi Klum's Halloween costumes?
Martin Izquierdo: Heidi usually comes up with the idea of what she wants to be. Then I do the designs/renderings. We meet halfway. There is talking and sketching before she starts filming "Project Runway" in town [NYC]. The first fitting happens before she is done shooting the show and then we fit again around the time of Fashion Week.

SL: Do you have a favorite costume?
MI: Each year, the costume we are working on is our favorite because it's a challenge. It's always our favorite.

SL: What was the most challenging costume to create?
MI: Making something comfortable for a pregnant woman -- the apple.

SL: Which is better: scary or sexy?
MI: Because it's Heidi, everything becomes sexy. Even when we did a vampire with a bleeding heart -- which on anyone else would be scary -- on her, extremely sexy.

Check back tomorrow morning for a first look at what Heidi Klum is going to be dressed as this year.

Meanwhile, here are some stylish Halloween costume ideas.

And check out this roundup of the most inappropriate Halloween costumes of all time.