19 Famous 'Grey's Anatomy' Guest Stars

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Can you BELIEVE that these famous faces were on Grey's Anatomy?

19 Famous 'Grey's Anatomy' Guest Stars

Guest stars always make things more interesting on Grey's Anatomy! And after 13 years, there have been a lot! So, here are 19 famous Grey's Anatomy guest stars that you might not have remembered!

1. Millie Bobby Brown

Who did they play? Ruby

What episode? Season 11, Episode 15

What else are they known for? Stranger Things

2. Abigail Breslin

Who did they play? Megan Clover

What episode? Season 3, Episode 3

What else are they known for? Scream Queens, Little Miss Sunshine

3. Dylan Minnette

Who did they play? Ryan

What episode? Season 4, Episode 5

What else are they known for? 13 Reasons Why

4. Keke Palmer

Who did they play? Sheryll Jeffries

What episode? Season 10, Episode 16

What else are they known for? Scream Queens, Grease Live!

5. Sarah Paulson

Who did they play? Young Ellis Grey

What episode? Season 6, Episode 15

What else are they known for? American Horror Story

6. Seth Green

Who did they play? Nick Hanscom

First episode? Season 4, Episode 9

What else are they known for? Austin Powers

7. Sarah Chalke

Who did they play? Casey Hedges

What episode? Season 9, Episode 19

What else are they known for? Scrubs

8. Mae Whitman

Who did they play? Heather Douglas

First episode? Season 3, Episode 11

What else are they known for? Parenthood

9. Liza Weil

Who did they play? Alison Clark

What episode? Season 5, Episode 23

What else are they known for? How To Get Away With Murder, Gilmore Girls

10. Edward Herrmann

Who did they play? Norman Shales

First episode? Season 4, Episode 3

What else are they known for? Gilmore Girls

11. Wilmer Valderrama

Who did they play? Kyle Diaz

First episode? Season 12, Episode 17

What else are they known for? That '70s Show

12. Kyle Chandler

Who did they play? Dylan Young

First episode? Season 2, Episode 16

What else are they known for? Friday Night Lights

13. Christina Ricci

Who did they play? Hannah Davies

First episode? Season 2, Episode 16

What else are they known for? Sleepy Hollow

14. Scott Foley

Who did they play? Henry Burton

First episode? Season 7, Episode 10

What else are they known for? Scandal

15. Demi Lovato

Who did they play? Hayley May

What episode? Season 6, Episode 22

What else are they known for? Camp Rock

16. Zach Gilford

Who did they play? Charlie Lowell

What episode? Season 5, Episode 23

What else are they known for? Friday Night Lights

17. Mandy Moore

Who did they play? Mary Portman

First episode? Season 6, Episode 24

What else are they known for? This Is Us

18. Jeffrey Dean Morgan

Who did they play? Denny Duquette

First episode? Season 2, Episode 13

What else are they known for? Supernatural

19. Hilarie Burton

Who did they play? Lauren Boswell

First episode? Season 9, Episode 2

What else are they known for? One Tree Hill

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