theres quite a few already on here. You can get 50 Cent, Tupac, Biggie, Drake, Eminem and more.
I found theres alot more when modding san andreas though. The good old days of Def Jam and EA recognising Urban Culture in the 2000's made it easy for modders to find and import models for celebrity rappers.
My San Andreas has them all from Xzibit, Methodman, Redman, 50 Cent, Michael Jackson, Ludacris, Lil Wayne and so many more!