In 2004, Seyfried was cast as one of the "Plastics", Karen Smith, in the movie Mean Girls. She went on to appear with a recurring role as Lilly Kane in the television series Veronica Mars. She also appeared as Rebecca on the series Wildfire.
Seyfried has had primetime cameo appearances on House and Law & Order. In 2006, she appeared in the film Alpha Dog, starring pop icon Justin Timberlake, and in the series Big Love.
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