It’s Halloween today. While going out in costume kinda goes out of style when you reach high school (before coming back in full force when you can legally drink in university), for celebrities, it’s a necessity for PR that they go out in costume at Halloween. I’m not sure that it’s so much a suggestion or a fun time for them as a mandate of their celebrity status.

Since it’s Halloween, let’s look at some past Halloween costumes worn by celebrities.

Adrianne Curry

AJ Lee

Alessandra Ambrosio

Alyssa Milano

Ashley Greene

Audrina Patridge

Blake Lively

Brooke Burke

Christina Aguilera

Christina Milian

Giada Di Laurentiis

Holly Madison

Jessica Lowndes

Jessica Simpson

Kate Upton

Katy Perry

Kendra Wilkinson

Kim Kardashian

Kristen Bell

Lindsay Ellingson

Lindsay Lohan

Mariah Carey

Miranda Kerr

Naya Rivera

Olivia Munn

Paris Hilton

Rihanna

Sara Underwood

Selita Ebanks

Stacy Keibler

Tara Reid