Here a list of the Character Faces that are already taken or reserved by someone. I will update the list whenever a new member puts up an introduction and is accepted, so this list should always be up to date.
I thought this makes it easier for any new members to see if a character face (singer/actor/celebrate) is still available or not.

So here it goes:

Taken Character Faces:

1. Eva LaRue (Natalia Boa Vista)
   
2. Carmine Giovinazzo (James Hamilton)
   
3. Simmone Jade Mackinnon (Rachel Evans)
   
4. Mandy Moore (Cpl. Amanda Monroe)
   
5. Aaron Jeffrey (Sgt. Christian Evans)
   
6. David Caruso (Lt. Horatio Caine)
   
7. Ewan McGregor (Henry McGeorge)
   
8. Carrie Underwood (Riley Caine)
   
9. Katrin Siska (Melissa Wolfe)
   
10. Jonathan Togo (Ryan Wolfe)
    
11. Alyssa Milano (Charleen Jade Hamilton)
    
12. Natalie Horler (Sasha Winters)
    
13. Kiefer Sutherland (Richard Gordon)
    
14. Kathrine Heigl (Ava Smith)
    
15. Hugh Jackman (Simon Wallcroft)
    
16. Nick Lachey (Dean Scott)
    
17. John Cena (John Triton)
    
18. Gary Sinise (Det. Mac Taylor)
    
19. Brad Pitt (David Biedermann)
    
20. Jill Hennessy (Det. London Carter)
    
21. Cote de Pablo (Maria Carter)
    
22. Jared Padalecki (Sam Miller)
    
23. Gary Oldman (Edward Roberts)
    
24. Sasha Parkinson (Ruby Westerholt)
    
25. Daniel Craig (James Bond)
    
26. Gerald Butler (Jack Richards)
    
27. Monica Belluci (Madison Lewis)
    
28. Rex Linn (Det. Frank Tripp)
    
29. Emma Watson (Maya Lewis)
    
30. Christopher Redman (Michael Travers)
    
31. Alan Rickman (Albert Mueller)
    
32. Jude Law (Dr. Victor Hunt)
    
33. Simon Baker (Patrick Jane)
    
34. Matt Smith (William McKinley)
    
35. Lucas Grabeel (Lexie Clarke)
    
36. Kieren Hutchison (Dr. Jonathan McKenna)
    
37. Gaspard Ulliel (Joshua Lucas)
    
38. Cameron Russell (Isabella Russell)
    
39. Dylan Patton (Cameron Russell)
    
40. Kristin Herrera (Ana Mariela Hernandez)
    
41. Emily Procter (Calleigh Duquesne)
    
42. Vanessa Hudgens (Vanessa Hunt)
    
43. Melanie C. (Amber Collins)
    
44. Adrien Nookadu (Casey Ryder)
    
45. Evan Ellingston (Kyle Harmon)
    
46. Josh Hutcherson (Jayson Munez)
    
47. Alex Pettyfer (Det. Aries Rodriguez)
    
48. Justin Bieber (Jason McCann)
    
49. Jennifer Garner (Annika Hoffmann)
    
50. Adam Rodriguez (Eric Delko)
    
51. Jessica Alba (Kelly Wolfe)

Reserved Character Faces:

1. none at the moment

And please do check the "Wanted Characters" section of this forum (Help Center) and see if maybe your wanted Face is one of those characters... or maybe you want to play one of these.