Everyone looked great!

Pauly D, girlfriend Aubrey O'Day, Maria Sharapova and a bunch of other celebs came out to attend blogger Just Jared's Halloween party last night in Silverlake, and it was quite the wild time!

The Jersey Shore star donned a knight in shining armor costume, while his lady love went as Cleopatra. The tennis ace, meanwhile, was the best Pippy Longstocking we've ever seen.

We're not quite sure what Ariel Winter was trying to be, but our best guess is a sexy zombie nurse?

Other celebs that were in attendance included Ryan Phillippe, Michelle Trachtenberg, Victoria Justice and Bieber's former fling Nicola Peltz. Check them all out in the below video!