It doesn't look like there will be a sequel to one of the best Entourage episodes ever. In that episode, Eric Roberts travels with the group to Joshua Tree where they spend the night high on Eric's home grown mushrooms. Well, now the father of Emma and brother of Julia is hanging out with Dr. Drew in Celebrity Rehab.
There is no word on what his addiction is, but he is roommates with Jeremy London so that should be interesting. I think Eric's participation was supposed to be a secret until the show aired, but Jeremy probably could not resist picking up a couple of bucks so spilled the secret to the tabloids.