Celebs Dressed As Celebs for Halloween: Pauly D, Matthew Morrison & More (PHOTOS)

We dress up as celebrities every Halloween, so why can’t real celebrities do it, too?

With the unofficial holiday just around the corner, Celebuzz is taking a look back at some of the best celebrity impersonations over the years, from DJ Pauly D as Justin Bieber to Matthew Morrison dressed up as – wait for it – Richard Simmons.

Which celebrity costume is your favorite? And who do you think will be impersonated this year?

Click through our gallery now to see some hilarious photos of celebs dressed as other celebs.