These 20 men all differ in the fact that almost half have made us laugh with their comedic vibes. Another third have won us over with their silky-smooth voices. And some keep us entertained with their late night talk shows. But one thing that they all have in common is that they were all in fraternities when they attended college. Delta Tau Delta, Sigma Chi, and Pi Kappa Alpha seem to be the most common, followed closely by Sigma Nu. 

1. Brad Pitt, actor

Sigma Chi (University of Missouri) 

2. Ashton Kutcher, actor

Delta Chi (University of Iowa) 

3. Matthew McConaughey, actor 

Delta Tau Delta (University of Texas, Austin) 

4. James Marsden, actor

Delta Tau Delta (Oklahoma State University, Stillwater) 

5. Jim Parsons, actor

Pi Kappa Alpha (University of Houston) 

6. Eric Stonestreet, actor

Pi Kappa Alpha (Kansas State University) 

7. Adam Sandler, actor

Tau Epsilon Phi (New York University) 

8. Nick Lachey, singer

Sigma Alpha Epsilon (Miami University) 

9. Luke Bryan, singer

Sigma Chi (Georgia Southern University) 

10. Seth Meyers, TV host

Phi Gamma Delta (Northwestern University) 

11. Will Ferrell, actor

Delta Tau Delta (University of Southern California) 

12. Paul Rudd, actor

Sigma Nu (University of Kansas) 

13. Ty Burrell, actor

Sigma Chi (University of Oregon) 

14. Harrison Ford, actor

Sigma Nu (Ripon College)

15. David Schwimmer, actor

Delta Tau Delta (Northwestern University) 

16. John Hamm, actor

Sigma Nu (University of Texas, Austin) 

17. David Letterman, TV host

Sigma Chi (Ball State University) 

18. John Stewart, TV host

Pi Kappa Alpha (College of William & Mary) 

19. Zach Braff, actor

Pi Kappa Psi (Northwestern University) 

20. Stephen Spielberg, director

Theta Chi (California State University, Long Beach)