Krysten Ritter, is that really you?!

The "Don't Trust the B---- In Apartment 23" star looked unrecognizable in her pre-Halloween selfie that she posted via Instagram on Tuesday.

Dressed as a zombie with a full face of green makeup and nasty scars, the actress used the costume to promote her appearance on "The Late Late Show."

"I'll be on The Late Late Show with @craigyferg promoting Listen Up Phillip tonight! And also this photo," she captioned the creepy pic.

Halloween is right around the corner, and we can't wait to see the crazy costumes our favorite stars will be rocking this year!

Need some inspiration for your own costume? Check out the galleries to see more of the most memorable celebrity costumes, and find out if you can spot the famous faces in their disguises.