Celebrities who train and their rank

Does anyone know any celebrities who train and if so what are their ranks. I swear I hear Keanu Reeves does but can't find his rank anywhere. Others are tom hardy I don't know his rank, purple or brown. Jonah hill I hear him talk about training but no clue on rank. The dude from forgetting Sarah Marshall..the funny guy with the beard he trains and is pretty good I think as well.