Guess Who is hiding behind those Costumes??

Last night's heavy partying at Spooktacular Halloween event probably left us wondering: Who was that face posing next to me?? So,Who are these people above?? Any clue??
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via Vogue and StyleBistro

Hints:

1.Debra Messing and Michael Kors

2. Martha Stewart

3. Marc Jacobs

4. Heidi Klum