20 People You Definitely Forgot Once Guest-Starred On These Popular Teen Dramas

    I think we'd all like to forget that Hilary Duff dated Dan on Gossip Girl.

    Andria Moore
    by Andria Moore

    BuzzFeed Contributor

    You know when you're watching a movie or show and an actor pops up onscreen and you sit there racking your brain to figure out where you've seen them?

    Ryan Reynolds looking super confused
    GIPHY / Via giphy.com

    Well, same. Except now you don't have to. Here are 20 famous people that once guest starred or starred in some of your favorite teen dramas:

    1. Shay Mitchell in Degrassi

    MsMojo / MTV / Via youtube.com

    She was only on the show for like a minute, but she OWNED that minute.

    2. Sophia Bush as Brooke in One Tree Hill

    The CW / Via youtube.com

    She played the complicated Brooke for nine seasons. 

    3. Shailene Woodley in The Secret Life of the American Teenager

    Clever News / Freeform / Via youtube.com

    "You're my whore."

    4. Janel Parrish as Mona in Pretty Little Liars

    Freeform / Via youtube.com

    Before she was Lana Condor's sister in To All the Boys I've Loved, she was nerd-turned-popular-girl-turned-murderer in PLL.

    5. Adam Brody as Seth in The O.C.

    HBO Max / Via youtube.com

    Ah yes, the teen heartthrob. 

    6. Chris Pratt on The O.C.

    HBO Max / Via youtube.com

    At this point, practically everyone and their mom appeared on The O.C.

    7. Lucy Hale as Hadley on The O.C.

    HBO Max / Via youtube.com

    She was Kaitlin's boarding school roommate.

    8. Amy Adams on Buffy the Vampire Slayer

    The WB / Via youtube.com

    She played Tara's cousin Beth for one episode.

    9. Kim and Khloé Kardashian on 90210

    The CW / Via youtube.com

    This one shocks me to my core.

    10. Rami Malek on Gilmore Girls

    The CW / Via youtube.com

    He honestly looks exactly the same.

    11. Tessa Thompson on Veronica Mars

    Warner Bros / ©Warner Bros/Courtesy Everett Collection

    The show was Tessa's television debut. 

    12. Paris Hilton on The O.C.

    The CW / Via youtube.com

    She plays "hot girl at a party that talks to Seth." 

    13. Hilary Duff on Gossip Girl

    The CW / Via youtube.com

    And dating Dan no less.

    14. Lindsay Lohan on Glee

    Fox / Via ontributors.buzzfeed.com

    She played herself as a judge at Nationals.

    15. Olivia Wilde on The O.C.

    The CW / Via youtube.com

    Olivia played Alex, a love interest of both Seth and Marissa.

    16. Sebastian Stan as Carter on Gossip Girl

    The CW / Via youtube.com

    How is Sebastian so good at being bad?

    17. Kate Hudson on Glee

    Fox / Via youtube.com

    She played Rachel's super-hot dance teacher at NYADA.

    18. Seth Rogen on Dawson's Creek

    The WB / Via youtube.com

    He appears in one episode as a sarcastic stoner. Accurate.

    19. Amanda Seyfried on Veronica Mars

    The CW / Via youtube.com

    Amanda played Veronica's best friend, Lilly, whose murder spurred the entire plot of the series. 

    20. And finally, Armie Hammer on Gossip Girl

    The CW / Via youtube.com

    He played Gabriel, Serena's con-artist boyfriend.