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    See What Your Favorite Celebrities Are Dressing Up As This Halloween

    From Katy Perry as a flaming hot Cheeto, to Beyonce as Janet Jackson.

    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:

    29. Beyonce and Blue Ivy as Janet and Michael Jackson:

    30. North West as a skunk:

    31. Demi Lovato and Wilmer Valderrama in Dia De Los Muertos costumes:

    32. Austin Mahone as a monk jedi:

    33. Adrian Grenier as a ring master:

    34. Camila Cabello as Princess Jasmine:

    35. Ed Sheeran as Austin Powers: