Scarlett Johansson
Kareem Abdul-Jabbar
John Legend
Bryan Greenberg
Kate Walsh
Tatyana Ali
Harold Perrineau Jr.
Aisha Tyler
Samuel Page
Enrique Murciano
Maya Rubin
Eric Balfour
Nicole Scherzinger
Taryn Manning
Amber Valletta
Auden McCaw
Kelly Hu
Adam Rodríguez
Eric Christian Olsen
Sarah Wright
Shoshannah Stern
Ed Kowalczyk
Fonzworth Bentley
Amaury Nolasco
Hill Harper
Nick Cannon
Herbie Hancock
Johnathon Schaech
Austin Nichols
Tracee Ellis Ross
Fred Goldring 
Anson Mount
Alfonso Ribeiro
Cliff Collins
Vera Farmiga.

Because of all the actors and singers and musicians and even one basketball player in this, I made it easier to see who they are. For all those suffering from that terrible affliction 'Where do I know that girl/guy from again?'-syndrome. ;)
Yes, it's a fan thing. Time for some levity.
In order of appearrance:
will.i.am, Scarlett Johansson, Kareem Abdul-Jabbar, Common, John Legend, Bryan Greenberg (guitar), Kate Walsh, Tatyana Ali, Harold Perrineau Jr., Aisha Tyler, Samuel Page, Enrique Murciano, Maya Rubin, Esthero, Eric Balfour, Nicole Scherzinger, Taryn Manning, Amber Valletta, Auden McCaw, Kelly Hu, Adam Rodríguez, Eric Christian Olsen, Sarah Wright, Shoshannah Stern, Ed Kowalczyk (guitar), Fonzworth Bentley (violin), Amaury Nolasco, Hill Harper, Nick Cannon, Herbie Hancock (piano), Johnathon Schaech, Austin Nichols, Tracee Ellis Ross, Fred Goldring (guitar), Anson Mount, Alfonso Ribeiro, Cliff Collins, Vera Farmiga.
The last four have mysteriously disappeared, however ...

Scarlett Johansson  battling it out with Kate Walsh for overexposure