A source tells E! News the 23-year-old actor, who won raves for his performance as society-shunner Chris McCandless in Into the Wild before dumbing down for the widely panned Speed Racer, has fired United Talent Agency's Shari Rosenzweig.

Our insider drew no direct connection between Hirsch's latest career move and the disappointing $18.6 million Speed Racer took in during its mega-hyped opening weekend (which included a major arse-whooping from the week-old Iron Man), but would only confirm that "he is not represented by UTA anymore. He has dropped his agent."

But it's not as if UTA didn't keep Hirsch working during the seven years he was there. Aside from his haunting turn in Into the Wild, his credits also include roles in the porn-star-neighbor comedy The Girl Next Door, the true-crime drama Alpha Dog, the skateboarding romp Lords of Dogtown, and the indie ensemble The Air I Breathe.

—Reporting by Whitney English