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There are no specifics about the character yet, though the site is reporting that Seyfried will appear in multiple episodes.
This will be Seyfried's first time appearing on a TV show since "Big Love" ended its run on HBO in 2011.
The new "Twin Peaks" will be a present-day continuation of the series that became a pop-culture hit in the early 1990s when it aired on ABC.
Kyle McLachlan will return as FBI Special Agent (and coffee/cherry pie enthusiast) Dale Cooper.
Filming is currently underway in Washington state, with "Peaks" co-creators David Lynch and Mark Frost once more having written all the episodes for the show.
Seyfried will be seen next in "Pan" out October 9.