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    20 Nickelodeon Celebrity Guest Stars You Probably Forgot About

    Turns out the Glee and Pretty Little Liars crew really loved Nickelodeon!

    1. Amy Poehler (SpongeBob SquarePants)

    2. Jordan Fisher (iCarly)

    3. Ashley Benson (Zoey 101)

    4. Janel Parrish (Zoey 101)

    5. Lucy Hale (Drake & Josh, Ned's Declassified School Survival Guide)

    6. Emily Ratajkowski (iCarly)

    7. Vanessa Hudgens (Drake & Josh)

    8. Austin Butler (iCarly)

    9. Dylan Minnette (Drake & Josh)

    10. Dianna Agron (Drake & Josh)

    11. Harry Shum, Jr (iCarly, Zoey 101)

    12. Jane Lynch (iCarly)

    13. Emma Stone (iCarly)

    14. Mark Hamill (SpongeBob SquarePants)

    15. Jim Parsons (iCarly)

    16. Alex Trebek (Rugrats)

    17. Johnny Depp (SpongeBob SquarePants)

    18. Ke$ha (Victorious)

    19. Jimmy Fallon and Tina Fey (iCarly)

    20. And finally, David Bowie (SpongeBob SquarePants)