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

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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

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

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

MsMojo / MTV / Via youtube.com

2.Sophia Bush as Brooke in One Tree Hill

She played the complicated Brooke for nine seasons. 

She played the complicated Brooke for nine seasons.

The CW / Via youtube.com

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

<div><p>"You're my whore."</p></div><span> Clever News / Freeform / Via <a href="https://www.youtube.com/watch?v=8QJcSTIVo0g" rel="nofollow noopener" target="_blank" data-ylk="slk:youtube.com;elm:context_link;itc:0;sec:content-canvas" class="link ">youtube.com</a></span>

"You're my whore."

Clever News / Freeform / Via youtube.com

4.Janel Parrish as Mona in Pretty Little Liars

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.

Ah yes, the teen heartthrob. 

Ah yes, the teen heartthrob.

HBO Max / Via youtube.com

6.Chris Pratt on The O.C.

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

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

HBO Max / Via youtube.com

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

She was Kaitlin's boarding school roommate.

She was Kaitlin's boarding school roommate.

HBO Max / Via youtube.com

8.Amy Adams on Buffy the Vampire Slayer

She played Tara's cousin Beth for one episode.

She played Tara's cousin Beth for one episode.

The WB / Via youtube.com

9.Kim and Khloé Kardashian on 90210

This one shocks me to my core.

This one shocks me to my core.

The CW / Via youtube.com

10.Rami Malek on Gilmore Girls

He honestly looks exactly the same.

He honestly looks exactly the same.

The CW / Via youtube.com

11.Tessa Thompson on Veronica Mars

The show was Tessa's television debut. 

The show was Tessa's television debut.

Warner Bros / ©Warner Bros/Courtesy Everett Collection

12.Paris Hilton on The O.C.

She plays

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

The CW / Via youtube.com

13.Hilary Duff on Gossip Girl

And dating Dan no less.

And dating Dan no less.

The CW / Via youtube.com

14.Lindsay Lohan on Glee

She played herself as a judge at Nationals.

She played herself as a judge at Nationals.

Fox / Via ontributors.buzzfeed.com

15.Olivia Wilde on The O.C.

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

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

The CW / Via youtube.com

16.Sebastian Stan as Carter on Gossip Girl

How is Sebastian so good at being bad?

How is Sebastian so good at being bad?

The CW / Via youtube.com

17.Kate Hudson on Glee

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

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

Fox / Via youtube.com

18.Seth Rogen on Dawson's Creek

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

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

The WB / Via youtube.com

19.Amanda Seyfried on Veronica Mars

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

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

The CW / Via youtube.com

20.And finally, Armie Hammer on Gossip Girl

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

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

The CW / Via youtube.com