Recently, Doug Ellin, who is the creator of Entourage, revealed which guest star gave him the most problems when filming the series. Doug said about the series, "When I realized that we had something — because I would sit and grind away — was when season 1 just started airing. We were in Las Vegas shooting an episode of season 2 and I didn’t know if anyone had any idea what the show was. We started shooting a scene, and Jerry Ferrara walked out to the pool and people started screaming [his character’s nickname] Turtle. I almost thought it was a bit because we just started airing three weeks earlier. It is wild to see." He continued on the various cameos featured in the series, "Most of them were pretty great. Usually the people that would come on the show were fans of the show. They would reach out to us about wanting to be on the show, so it was always a good experience." He added, "Somehow we ended up with Christina Aguilera, who did not want to be there. I didn’t know if she didn’t know what the show was." Ellin continued, "She refused to do off-camera dialogue, so when Jeremy Piven was doing his scene she would just sit there and go, 'Blah, blah, blah.' I tried to talk to her, and that was the one time. But it worked out." Story source: usmagazine.com