It seems like every actor working in Hollywood with a few hours to spare appeared on an episode of "Entourage" at some point. The HBO hit had dozens of cameos and guest stars throughout its eight-season run, so if you weren't cast as a client of Ari Gold's or a Vincent Chase hook-up, apparently you were nobody in the mid-2000s. The "Entourage" movie hits theaters this week and is set to be chock-full of famous faces. Before the boys are back on the big screen, look back at some memorable (and not so memorable) cameos from "Entourage''s star-studded history.