1. Katy Perry as a flaming hot Cheeto:
2. Colton Haynes as Fiona from Shrek:
3. Lucy Hale as the Twitter bird:
4. Naya Rivera as a mail order bride:
5. Taylor Swift as a pegacorn:
6. Chris Colfer as Grumpy Cat:
7. Luke & Calum from 5SOS as Mario and Luigi:
Mario and Luigi dominated the dance floor as per usual
8. Ashley Benson as a doll:
9. Bill and Giuliana Rancic as a plastic surgeon and patient:
10. Liv Tyler as a bun in the oven:
11. Lauren Conrad as a mermaid:
12. Kate Hudson as Mother of Anarchy:
13. Ashley Tisdale as a skeleton:
14. Janel Parrish as a cat:
15. Paris Hilton as Minnie Mouse:
16. Kelly Osbourne as Magenta from The Rocky Horror Picture Show:
17. Lily Allen as Dr. Luke....
18. Matthew Morrison and his wife as Vincent Vega and Mia Wallace from Pulp Fiction:
Thanks to @FreixenetUSA for an amazing birthday/Halloween celebration. #FXHalloween
19. Michelle Trachtenberg as Black Dahlia:
20. Molly Sims as a 70s go go girl:
21. Gavin Rossdale as a vampire:
22. Annalynne McCord as a "creepy chick":
23. Ashley Madekwe as The Joker:
24. Lance Bass as a spooky carnival dude (that looks straight off of American Horror Story: Freakshow):
25. Cindy Crawford as Cher:
26. Aaron Eckhart as an Army dude:
27. Justin Bieber as a Power Ranger
28. Neil Patrick Harris & family as Batman characters:
Happy Halloween from Gotham City!!