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A spokeswoman for the actress says the "Walk the Line" star wed her fiancé, Hollywood agent Jim Toth, in Ojai, Calif., about 90 miles north of Los Angeles. Publicist Nicole Perna did not reveal details about the Saturday ceremony.
Usmagazine.com first reported the nuptials.
The Oscar-winning actress and Toth announced their engagement in December.
Toth is an agent for Creative Artists Agency, which represents Witherspoon through another agent.
The 35-year-old actress won an Academy Award for her portrayal of June Carter in 2005's "Walk the Line." Witherspoon's other film credits include "Legally Blonde," "Four Christmases" and the forthcoming "Water for Elephants."
She was previously married to actor Ryan Phillippe, with whom she has two children: 11-year-old daughter Ava and 7-year-old son Deacon.